diff --git a/README.md b/README.md
index f31967d..8d67bc8 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # CTAO Science Portal — simple proof of concept
 
-The `simple` branch uses the sibling `mockup` project's layout, assets, CSS,
+The `main` branch uses the sibling `mockup` project's layout, assets, CSS,
 and header interactions. Astro generates a static site. Sveltia CMS edits
 exactly four Markdown pages in the separate `ctao/content` repository.
 
@@ -80,10 +80,10 @@ needed to display the button. A Markdown blockquote receives the mockup's
 highlight styling. Images without alternative text are treated as decorative.
 Menu labels, ordering, URLs, and the shared site layout remain code-controlled.
 
-Remote editing uses Gitea OAuth and saves to **`ctao/content`, branch `simple`**.
+Remote editing uses Gitea OAuth and saves to **`ctao/content`, branch `main`**.
 That branch must contain the four files from `sample-content/pages/` and the
 sample upload before publishing this version. The code mirror is
-**`ctao/portal`, branch `simple`**. Deployment independently selects
+**`ctao/portal`, branch `main`**. Deployment independently selects
 `CODE_BRANCH` and `CONTENT_BRANCH`, overlays content, runs checks, and publishes
 atomically. `CONTENT_BRANCH` must match `backend.branch` in the CMS config.
 
diff --git a/deploy/README.md b/deploy/README.md
index a3cadba..62adb8b 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -29,27 +29,28 @@ missing). Everything else runs inside containers.
 | 3000 | Gitea | https://astro-git.isl-dev.grid.cyfronet.pl (ingress vhost) |
 | 8080 | portal (nginx, static) | https://astro.isl-dev.grid.cyfronet.pl (ingress vhost) |
 
-## Switch an existing demo to `simple`
+## Publish the simplified portal from `main`
 
-1. In a checkout of `ctao/content`, create a `simple` branch from the existing
-   content branch. Copy `sample-content/pages/*.md` and
+1. In a checkout of `ctao/content`, switch to `main`. Copy the missing
+   Example files from `sample-content/pages/` and
    `sample-content/uploads/hero.jpg` from this code repository into its root
-   `pages/` and `uploads/` directories, then commit the seed files. Existing
+   `pages/` and `uploads/` directories, then commit the seed files. Preserve
+   any existing editorial versions of these files. Existing
    news or other page files can remain in the content history; this portal
    loads only the four Example files.
-2. Push the content branch to Gitea as `ctao/content:simple`, and the code
-   branch as `ctao/portal:simple`. These are separate pushes; Bitbucket is
+2. Push the content branch to Gitea as `ctao/content:main`, and the code
+   branch as `ctao/portal:main`. These are separate pushes; Bitbucket is
    not the deployment remote.
 3. Copy the updated `build.sh` to `~/ctao-portal-demo/bin/build.sh` and the
    updated `ctao-portal-build.service` to `~/.config/systemd/user/`. Reload
    systemd with `systemctl --user daemon-reload`. The service explicitly sets
-   `CODE_BRANCH=simple` and `CONTENT_BRANCH=simple`; the script defaults agree.
+   `CODE_BRANCH=main` and `CONTENT_BRANCH=main`; the script defaults agree.
 4. Start the build service or let its timer run. It overlays `pages/` and
    `uploads/`, clears the previous news overlay, and runs `npm run check`
    before the atomic release switch. Missing Example pages fail the build.
 5. Verify the four `/example/…/` pages and empty `/news/`. Sign in at `/admin/`,
    save an Example title, and check that a commit appears on
-   `ctao/content:simple` and the rebuilt page reflects it.
+   `ctao/content:main` and the rebuilt page reflects it.
 
 The OAuth client and public portal origin stay the same. Sveltia's
 `backend.branch` in `public/admin/config.yml` must always match
@@ -57,8 +58,13 @@ The OAuth client and public portal origin stay the same. Sveltia's
 environment variable is no longer used. For a separate preview hostname,
 update the site origin, OAuth redirect, and Gitea CORS together.
 
-To roll back, restore the previous deployed release and the previous worker
-script/service configuration. The original content `main` branch is retained.
+To undo the simplification in shared code history, use
+`git revert -m 1 <simplification-merge-commit>` on `main` and publish the
+resulting commit. The previous portal code is also preserved at `0772462`.
+For an immediate deployment rollback, restore the previous release and worker
+script/service configuration. Content has its own history: reverting a code
+commit does not revert CMS edits. Keep the old content files available if
+the previous portal may be restored.
 
 ## Install (each step reviewed before running; [W] = writes to the machine)
 
@@ -84,12 +90,12 @@ script/service configuration. The original content `main` branch is retained.
    password never lands in a file or shell history:
    `podman exec -it ctao-demo-gitea gitea admin user create --admin --username <you> --email <you@…> --random-password`
 7. **[W]** In the Gitea UI: create org `ctao` with repos `portal` and
-   `content` (both public read). Seed the content `simple` branch with
+   `content` (both public read). Seed the content `main` branch with
    `sample-content/pages/` and `sample-content/uploads/` as described above.
    Then, from your workstation, push both over
    the vhost with a repo-scoped token:
-   `git push https://<user>:<token>@astro-git.isl-dev.grid.cyfronet.pl/ctao/portal.git simple`
-   `git push https://<user>:<token>@astro-git.isl-dev.grid.cyfronet.pl/ctao/content.git simple`
+   `git push https://<user>:<token>@astro-git.isl-dev.grid.cyfronet.pl/ctao/portal.git main`
+   `git push https://<user>:<token>@astro-git.isl-dev.grid.cyfronet.pl/ctao/content.git main`
 8. **[W]** `systemctl --user enable --now ctao-portal-build.timer`. The first run
    clones + `npm ci` + builds (minutes); later runs are seconds. Wait until
    `journalctl --user -u ctao-portal-build -n 5` shows `published <sha>`
diff --git a/deploy/build.sh b/deploy/build.sh
index 211e8f8..9beec2d 100755
--- a/deploy/build.sh
+++ b/deploy/build.sh
@@ -17,8 +17,8 @@ BASE="${BASE:-$HOME/ctao-portal-demo}"
 GITEA_URL="${GITEA_URL:-http://localhost:3000}"   # published by ctao-demo-gitea
 CODE_REPO="${CODE_REPO:-ctao/portal}"             # owner/repo in Gitea
 CONTENT_REPO="${CONTENT_REPO:-ctao/content}"
-CODE_BRANCH="${CODE_BRANCH:-simple}"
-CONTENT_BRANCH="${CONTENT_BRANCH:-simple}"
+CODE_BRANCH="${CODE_BRANCH:-main}"
+CONTENT_BRANCH="${CONTENT_BRANCH:-main}"
 BUILD_IMAGE="${BUILD_IMAGE:-localhost/ctao-portal-build:1}"
 # The build joins the Gitea container's network namespace: localhost inside
 # the build = Gitea's loopback (port 3000), host loopback stays unreachable.
diff --git a/deploy/ctao-portal-build.service b/deploy/ctao-portal-build.service
index 145bb24..6bb458d 100644
--- a/deploy/ctao-portal-build.service
+++ b/deploy/ctao-portal-build.service
@@ -8,8 +8,8 @@ Description=CTAO portal demo — rebuild if the code or content repo has new com
 
 [Service]
 Type=oneshot
-Environment=CODE_BRANCH=simple
-Environment=CONTENT_BRANCH=simple
+Environment=CODE_BRANCH=main
+Environment=CONTENT_BRANCH=main
 ExecStart=%h/ctao-portal-demo/bin/build.sh
 # Polite neighbour on the shared VM:
 Nice=10
diff --git a/public/admin/config.yml b/public/admin/config.yml
index ca1c1c1..a8bc9b5 100644
--- a/public/admin/config.yml
+++ b/public/admin/config.yml
@@ -7,7 +7,7 @@ backend:
   # Keep this branch in sync with CONTENT_BRANCH in deploy/build.sh.
   # Seed the content branch from sample-content/ before deploying.
   repo: ctao/content
-  branch: simple
+  branch: main
   base_url: https://astro-git.isl-dev.grid.cyfronet.pl
   api_root: https://astro-git.isl-dev.grid.cyfronet.pl/api/v1
   app_id: cf1c44ac-ebe6-4a97-bf2f-f7f26ef1126c
diff --git a/scripts/local-content.mjs b/scripts/local-content.mjs
index e6acb87..a75714f 100644
--- a/scripts/local-content.mjs
+++ b/scripts/local-content.mjs
@@ -12,7 +12,7 @@ if (!existsSync(local)) {
   cpSync(join(root, 'sample-content/uploads'), join(local, 'uploads'), { recursive: true });
 }
 if (!existsSync(join(local, '.git'))) {
-  execFileSync('git', ['init', '--quiet', '--initial-branch=simple', local], { stdio: 'inherit' });
+  execFileSync('git', ['init', '--quiet', '--initial-branch=main', local], { stdio: 'inherit' });
 }
 execFileSync(process.execPath, [join(root, 'scripts/content.mjs'), local], { stdio: 'inherit' });
 console.log(`In Sveltia, choose Work with Local Repository and select: ${local}`);