Add markdown enhancements

This commit will bring:
- Linking to other users with `@username`
- Linking to tags with `#tag`
- Opening external links in new tab (Fix #1647)
- Single line breaks to avoid confusion for non-technical users (Fix #1377)
- 😒 support...
- Email encoding in markdown
- Markdown editor now auto-resizes to accomodate content (Fix #1379)

NOTE: This only works in very few places. We need to wait for #1835 to have those features available widely

.gitpod.yml

@@ -32,6 +32,8 @@ tasks:
       poetry run python manage.py gitpod dev
 
   - name: Frontend
+    env:
+      VUE_EDITOR: code
     before: cd front
     init: |
       yarn install
@@ -42,6 +44,7 @@ tasks:
     env:
       COMPOSE_FILE: /workspace/funkwhale/.gitpod/docker-compose.yml
       ENV_FILE: /workspace/funkwhale/.gitpod/.env
+      VUE_EDITOR: code
     command: |
       clear
       echo ""