Small docs site tweaks (#954)

* Add yarn.lock to .gitignore

* Tweak announcementBar message

* Add demo link to docs homepage

* chore(docs): logo-meaning page cleanup

* chore(docs): support page cleanup

* chore(docs): tech-stack page cleanup

* chore(docs): requirements page cleanup

* Update main README warning to match docs site

* Add clearer documentation link to main README

* chore(docs): one-step-install page cleanup

* chore(docs): Security: remove example JWT_SECRET value

* chore(docs): recommended-install page cleanup

* chore(docs): portainer-install page cleanup

* chore(docs): unraid-install page cleanup

README.md

@@ -22,7 +22,7 @@
 
 - ⚠️ The project is under **very active** development.
 - ⚠️ Expect bugs and breaking changes.
-- ⚠️ **Do not use as a single source to store of your photos and videos!**
+- ⚠️ **Do not use it as the only way to store your photos and videos!**
 
 ## Content
 
@@ -35,6 +35,10 @@
 - [Support The Project](#support-the-project)
 - [Known Issues](#known-issues)
 
+## Documentation
+
+You can find the main documentation, including installation guides, at https://immich.app/.
+
 ## Demo
 
 You can access the web demo at https://demo.immich.app