Minor, update URLs and clean up a bit

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

mkdocs.yml

@@ -1,7 +1,7 @@
 site_name: Documentation
 site_description: Fast Init for Linux Systems
-site_url: https://troglobit.github.io/finit/
-repo_url: https://github.com/troglobit/finit
+site_url: http://finit-project.github.io/finit/
+repo_url: https://github.com/finit-project//finit
 repo_name: troglobit/finit
 copyright: Copyright © 2008-2025 Joachim Wiberg
 docs_dir: doc/
@@ -61,6 +61,7 @@ nav:
     - Files & Layout: config/files.md
     - Conditions: conditions.md
     - Cgroups: config/cgroups.md
+    - Capabilities: config/capabilities.md
     - Environment Variables: config/env.md
     - One-shot Tasks: config/task-and-run.md
     - Services: