Fix bookmarks menu dismiss, home Email URL, and deploy hygiene.

Close the hamburger panel on outside click/focus via X11 (xinput/xdotool)
without a fullscreen overlay; point home Email to Roundcube; sync
home-screen-index.html in deploy/install; remove credentials.md from git
and document private LAN-only Gitea usage.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -2,3 +2,4 @@ __pycache__/
 *.pyc
 *.pyo
 .env
+credentials.md