Round 5 improvements: complete automation and documentation fixes

- Fix password file ownership (user can now read without sudo)
- Add dashboards stack to automated deployment (Step 5/6)
- Add SSL certificate notes to deploy script output
- Clarify .env file location in documentation (stays in repo folder)
- Update README and getting-started.md with accurate deployment steps
- Add Watchtower notification URL documentation
- Improve user feedback with admin credentials and dashboard URLs
- Remove dashboards from 'Next Steps' since it's now automated

User experience improvements:
- Password file readable by user immediately
- Homepage and Homarr deployed automatically
- Clear guidance on .env file management
- Better SSL certificate expectations

.env.example

@@ -109,6 +109,12 @@ QBITTORRENT_PASS=changeme
 PIHOLE_PASSWORD=changeme
 
 # Watchtower Notifications (optional)
+# If not set, Watchtower will still update containers but without notifications
+# Supports various notification services via Shoutrrr URL format
+# Examples: 
+#   Discord: discord://token@webhookid
+#   Slack: slack://token@channel
+#   Email: smtp://username:password@host:port/?from=sender@example.com
 # WATCHTOWER_NOTIFICATION_URL=
 
 # ====================================