feat(deep-linking): allow disabling through override

config.js

     // use only.
     // _desktopSharingSourceDevice: 'sample-id-or-label'
 
+    // If true, any checks to handoff to another application will be prevented
+    // and instead the app will continue to display in the current browser.
+    // disableDeepLinking: false
+
     // A property to disable the right click context menu for localVideo
     // the menu has option to flip the locally seen video for local presentations
     // disableLocalVideoFlip: false

react/features/base/config/functions.any.js

     'disableAGC',
     'disableAP',
     'disableAudioLevels',
+    'disableDeepLinking',
     'disableH264',
     'disableHPF',
     'disableNS',

react/features/deep-linking/functions.js

     const { room } = state['features/base/conference'];
 
     // Show only if we are about to join a conference.
-    if (!room) {
+    if (!room || state['features/base/config'].disableDeepLinking) {
         return Promise.resolve();
     }