suppress 'convert' from new pad modal

and make it easy to configure what's displayed via a list in appconfig

www/common/application_config_internal.js

@@ -22,6 +22,12 @@ define(function() {
      */
     AppConfig.registeredOnlyTypes = ['file', 'contacts', 'notifications', 'support'];
 
+    // XXX to prevent apps that aren't officially supported from showing up
+    // in the document creation modal
+    AppConfig.hiddenTypes = ['drive', 'teams', 'contacts', 'todo', 'file', 'accounts', 'calendar', 'poll', 'convert',
+    //'doc', 'presentation'
+    ];
+
     /* CryptPad is available is multiple languages, but only English and French are maintained
      * by the developers. The other languages may be outdated, and any missing string for a langauge
      * will use the english version instead. You can customize the langauges you want to be available

www/common/common-ui-elements.js

@@ -2075,15 +2075,9 @@ define([
 
         var $container = $('<div>');
         var i = 0;
+
         var types = AppConfig.availablePadTypes.filter(function (p) {
-            if (p === 'drive') { return; }
-            if (p === 'teams') { return; }
-            if (p === 'contacts') { return; }
-            if (p === 'todo') { return; }
-            if (p === 'file') { return; }
-            if (p === 'accounts') { return; }
-            if (p === 'calendar') { return; }
-            if (p === 'poll') { return; } // Replaced by forms
+            if (AppConfig.hiddenTypes.indexOf(p) !== -1) { return; }
             if (!common.isLoggedIn() && AppConfig.registeredOnlyTypes &&
                 AppConfig.registeredOnlyTypes.indexOf(p) !== -1) { return; }
             return true;

www/common/drive-ui.js

@@ -3082,6 +3082,7 @@ define([
             }
             // Pads
             getNewPadTypes().forEach(function (type) {
+                if (AppConfig.hiddenTypes.indexOf(type) !== -1) { return; }
                 var $element = $('<li>', {
                     'class': 'cp-app-drive-new-doc cp-app-drive-element-row ' +
                              'cp-app-drive-element-grid'