This adds the ability to configure hiding the logo on the deep linking page.
HIDE_DEEP_LINKING_LOGO defaults to false in the config.
The implementation also defaults to showing the logo if HIDE_DEEP_LINKING_LOGO
is missing from the config.

The lobby feature adds the possibility to lock a meeting and only allow people in after virtually knocking and going through formal approval

* Add dialog to set the E2EE key
* Use the Redux action / middleware to update the key even when set through the
  hash parameter
* Cleanup URL after processing the key so it's not recorded in browser history

This reverts commit 4824c8714a.

This will let us enable/disable the feature based on environment/deployment

For now all keys are whitelisted.

* Configurable (sub)optimal and unsupported browsers

* maybe this helps somehow

This reverts commit f42d0411b1.

The UX provided by this feature flag in its current state is not
desired. Also, I noticed filmstrip sometimes failing to properly
update small video display mode on pin/unpin. The feature is
being left in for consumers of jitsi-meet to enable as needed.

* Removes unused ADD_PEOPLE_APP_NAME
* Moves deep-link header background and logo size as variables.
* Fixes more numbers page space in the header.
* Fixes left padding on deep-linking mobile page.