Merge pull request readthedocs#5293 from rtfd/davidfischer/remove-apiv1

Remove the v1 API

Author: humitos

docs/api/index.rst

@@ -5,16 +5,9 @@ This section of the documentation details the public API
 usable to get details of projects, builds, versions and other details
 from Read the Docs.
 
-.. warning::
-
-    Originally, the Read the Docs API allowed connections over insecure HTTP.
-    Starting in January 2019, requests over HTTP
-    will be automatically redirected to HTTPS
-    and non-GET/HEAD requests over insecure HTTP will fail.
 
 
 .. toctree::
     :maxdepth: 3
 
     v2
-    v1