feat(cms): implement Git publishing for content changes and add entrypoint script

- Added a Docker entrypoint script to manage content repository cloning and updates.
- Updated server configuration to include public URL and proxy settings.
- Enhanced content file utilities to return file paths for written entries.
- Introduced GitPublisher class for handling Git operations and deployments.
- Added tests for Git publishing functionality.
- Updated Dockerfile and docker-compose for production setup.
- Added new public PGP key and security.txt for contact information.
- Created new About and Archive pages in the site.
- Updated site configuration to include new navigation links.

sws.toml

@@ -1,9 +1,12 @@
+[general]
+page404 = "./404.html"
+
 [advanced]
 
 [[advanced.headers]]
 source = "**"
 [advanced.headers.headers]
-Content-Security-Policy = "default-src 'self'; script-src 'self' 'unsafe-inline' https://www.googletagmanager.com https://utteranc.es https://static.cloudflareinsights.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: https://www.google-analytics.com; font-src 'self'; connect-src 'self' https://www.google-analytics.com https://cloudflareinsights.com; frame-src https://www.youtube-nocookie.com https://utteranc.es; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests"
+Content-Security-Policy = "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; connect-src 'self'; frame-src https://www.youtube-nocookie.com; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests"
 X-Frame-Options = "DENY"
 X-Content-Type-Options = "nosniff"
 Referrer-Policy = "strict-origin-when-cross-origin"