Move Gitea README.md file to docs/

Renamed file to CONFIGURING.SourceGitea.md for consistency with other
plugins.

Author: dregad

README.md

@@ -129,7 +129,7 @@ or the relevant branch in the Plugin's GitHub repository, as per the table below
     * [SourceViewVC](docs/CONFIGURING.SourceViewVC.md)
     * [SourceSVN](docs/CONFIGURING.SourceSVN.md)
     * [SourceVisualSVNServer](docs/CONFIGURING.SourceVisualSVNServer.md)
-    * [SourceGitea](SourceGitea/README.md)
+    * [SourceGitea](docs/CONFIGURING.SourceGitea)
 
 9. Once configured, click the "Return to Repository" link and click either
    the "Import Everything" or "Import Newest Data" button to perform initial