Docs Revamp: new "Main" page for hub-docs (#88)

Create Hugging Face Hub main doc page, with bolded items intended as future links to docs.

Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

docs/hub/_sections.yml

@@ -4,47 +4,5 @@
 - local: repositories-main
   title: Repositories
 
-- local: main
-  title: Hub documentation
-
-- local: model-repos
-  title: Everything you wanted to know about repos
-
-- local: adding-a-model
-  title: Adding a model to the Hub
-
-- local: libraries
-  title: Libraries
-
-- local: inference
-  title: Inference
-
-- local: endpoints
-  title: Hub API Endpoints
-
-- local: spaces
-  title: Spaces documentation
-
-- local: org-cards
-  title: Organization cards
-
-- local: adding-a-library
-  title: Integrate a library with the Hub
-
-- local: searching-the-hub
-  title: How to search the Hub efficiently
-
-- local: how-to-downstream
-  title: How to download files from the Hub
-
-- local: how-to-upstream
-  title: How to create repositories and upload files to the Hub
-
-- local: how-to-inference
-  title: How to use the Inference API from the Hub library
-
-- local: adding-a-task
-  title: Adding a new task to the Hub
-
-- local: security
-  title: Security tips
+- local: models-main
+  title: Models