added context documentation (#243)

* added context documentation

* added context

* added context side bar title

* added context side bar title

* added context warning

* adjusted auth title

* adjusted removed supported actions

* adjusted date

* Update file casing

* Keep sidebar titles capitalized

* added feedback

* added feedback

---------

Co-authored-by: eric-brown <eric.brown@coinbase.com>

Author: soheimam

docs/docs.json

@@ -446,7 +446,8 @@
             "pages": [
               "mini-apps/features/overview",
               "mini-apps/features/manifest",
-              "mini-apps/features/Authentication",
+              "mini-apps/features/authentication",
+              "mini-apps/features/context",
               "mini-apps/features/embeds-and-previews",
               "mini-apps/features/search-and-discovery",
               "mini-apps/features/sharing-and-social-graph",