Publish topic guides to the wiki and document tabbed windows

Publish the guides from this repository to the GitHub Wiki. Organize them into Usage, Configuration and Development, with 15 separate configuration topics and redirects for the former website guide URLs.

Add a tabbed-windows guide covering grouping, switching tabs and taking windows out. Document the scrolling indicator's defaults and limits, and link the guide from the README, shortcuts and IPC pages. Update from main, including the latest tabbed-layout changes.

Separate Activities setup, configuration and publishing documentation. Review the guide prose with the unslop skill, keeping existing examples and heading links. The wiki workflow uses GitHub's built-in token to publish documentation changes on main.

Validation:

- 20 documentation tests pass, including README links and Activities/tab-indicator field coverage.
- The publisher builds 46 wiki pages; the site build and Python syntax checks pass.
- All 115 code examples from main are preserved.
- The Python suite passes: 90 tests passed and 31 opt-in integration tests skipped, with the system GI module available.

docs/configuration/startup-and-locking.md

@@ -0,0 +1,39 @@
+# Login items and locking
+
+| `autostart` key | Type | Default | Meaning |
+| --- | --- | --- | --- |
+| `command` | nonempty argument array | required | Foreground process, not a self-daemonizing command |
+| `enabled` | boolean | `true` | Start service |
+| `restart` | boolean | `true` | Restart after exit, with a five-second retry delay |
+| `nested` | boolean | `false` | Also run in nested previews |
+
+Unchanged services keep running on reload; removed/disabled items stop. To lock
+after five minutes and before sleep:
+
+```kdl
+autostart {
+    command "swayidle" "-w" "timeout" "300" "ferese-lock" "before-sleep" "ferese-lock" "lock" "ferese-lock"
+}
+```
+
+The locked display dims after 30 seconds and sleeps after 120 seconds of
+inactivity. Settings → Lock screen changes `lock-screen.dim-after-seconds` and
+`lock-screen.sleep-after-seconds`; zero disables each action. Input wakes the
+display without unlocking. Display sleep does not suspend the computer.
+
+`ferese-lock` is the native PAM-authenticated locker. It follows your wallpaper,
+colors, font and shell corner radius. Its command returns successfully only after
+the compositor confirms the lock; the UI keeps running until authentication
+succeeds. `--foreground` keeps the command attached to its UI process.
+
+Use `ferese-lock --preview` for an ordinary window that never locks or checks a
+password. See [Native locker](../locking.md) for setup and verification. Test real
+unlock in a nested compositor before enabling automatic locking. A crashed
+locker leaves the session locked; recovery requires ending that session from
+another TTY.
+
+## Power and logout
+
+Power actions use a centered confirmation. **Super+Shift+E** and
+`feresectl request-logout` ask to log out. `feresectl exit` ends the session
+immediately.