Editor: Separate stored MicroPython version and fix rtd link.

The URL used to get generated based on the UPY_VERSION global,
however the current v2 documentation URL doesn't follow this patter
and might not exists forever (right now is a branch in the micropython
repository). So for now the editor will link to the docs entry
point.

Author: microbit-carlos

editor.html

@@ -79,7 +79,8 @@
         <script type="application/javascript">
             // VERSION INFORMATION
             EDITOR_VERSION = "2.1.0-beta.6";
-            UPY_VERSION = "1.0.1/2.0-3e09245a46";
+            UPY_1_VERSION = "1.0.1";
+            UPY_2_VERSION = "2.0-3e09245a46";
         </script>
         <script id="files-template" type="x-tmpl-mustache">
           <div id="files-modal" tabindex="-1" role="dialog" aria-label="load/save modal" aria-modal="true" class="modal-div">
@@ -345,7 +346,7 @@ <h2><i class="fa fa-unlock-alt"></i> <strong>{{ title }}</strong></h2>
                     </div>
                     <div class="buttons_menu_rhs">
                         <div class="buttons_menu_item"><span id="editor-ver">Editor Version:</span> <script>document.write(EDITOR_VERSION);</script></div>
-                        <div class="buttons_menu_item"><span id="mp-ver">MicroPython Version:</span> <script>document.write(UPY_VERSION);</script></div>
+                        <div class="buttons_menu_item"><span id="mp-ver">MicroPython Version:</span> <script>document.write(UPY_1_VERSION + '/' + UPY_2_VERSION);</script></div>
                     </div>
                 </div>
                 <div id="small-icons-left" class="vbox small-icons">

python-main.js

@@ -1807,10 +1807,6 @@ function web_editor(config) {
                 })
         });
 
-        // Update the MicroPython docs link to append the version to the URL
-        var docsAnchor = $('#docs-link');
-        docsAnchor.attr('href', docsAnchor.attr('href') + 'en/v' + UPY_VERSION);
-
         window.addEventListener('resize', function() {
             formatMenuContainer('command-options', 'options_container');
             formatMenuContainer('command-help', 'helpsupport_container');