update toc for resources

README.md

@@ -11,13 +11,13 @@
 ## Contents
 
 - [Resources](#resources)
-- [Official Resources](#official-resources)
-- [External Resources](#external-resources)
-- [Community](#community)
-- [Conferences](#conferences)
-  - [YouTube Channels](#conference-youtube-channels)
-- [Meetups](#meetups)
-- [Podcasts](#podcasts)
+  - [Official Resources](#official-resources)
+  - [External Resources](#external-resources)
+  - [Community](#community)
+  - [Conferences](#conferences)
+    - [YouTube Channels](#conference-youtube-channels)
+  - [Meetups](#meetups)
+  - [Podcasts](#podcasts)
 - [Third-Party Packages](#third-party-packages)
   - [Django](#django-third-party-packages)
   - [Django REST Framework](#django-rest-framework-third-party-packages)