Added 3.9 Origin docs + Dedicated Docs to 3.7

Author: vikram-redhat

_distro_map.yml

@@ -27,6 +27,9 @@ openshift-origin:
     enterprise-3.7:
       name: '3.7'
       dir: '3.7'
+    enterprise-3.9:
+      name: '3.9'
+      dir: '3.9'
 openshift-online:
   name: OpenShift Online
   author: OpenShift Documentation Project <[email protected]>
@@ -84,7 +87,7 @@ openshift-dedicated:
   site_name: Documentation
   site_url: https://docs.openshift.com/
   branches:
-    enterprise-3.6:
+    enterprise-3.7:
       name: 'Latest'
       dir: dedicated
 atomic-registry:

index-community.html

@@ -58,6 +58,8 @@ <h1 class="cover-heading">Documentation</h1>
              <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-expanded="false">Select Version<span class="caret"></span></button>
              <ul class="dropdown-menu" role="menu">
                <li><a href="latest/"><i class="fa fa-arrow-circle-o-right"></i> Origin Latest</a></li>
+               <li><a href="3.9/"><i class="fa fa-arrow-circle-o-right"></i> Origin 3.9</a></li>
+               <li><a href="3.7/"><i class="fa fa-arrow-circle-o-right"></i> Origin 3.7</a></li>
                <li><a href="3.6/"><i class="fa fa-arrow-circle-o-right"></i> Origin 3.6</a></li>
                <li><a href="1.5/"><i class="fa fa-arrow-circle-o-right"></i> Origin 1.5</a></li>
                <li><a href="1.4/"><i class="fa fa-arrow-circle-o-right"></i> Origin 1.4</a></li>