feat: update README files for realtime collab

- Added a section on real-time collaboration in all language-specific README files, detailing how to invite members and chat in real-time.
- Included visual elements to enhance user understanding of the new features.
- Updated the homepage to include new use cases for real-time chat and comments, improving the overall user experience.

surfsense_web/content/docs/how-to/meta.json

@@ -1,5 +1,5 @@
 {
 	"title": "How to",
-	"pages": ["electric-sql"],
+	"pages": ["electric-sql", "realtime-collaboration"],
 	"defaultOpen": false
 }