Remove some unused variables
Replace variables that are only used once with their value

- small refactor

- redesign deeplinking mobile page, desktop page and dial in number page
- now dial in number page is an entry point in app.bundle.

Move some styles from SCSS to JSS
Convert some files to TS
Implement redesign

Add the ability (for moderators) to end the meeting for everyone.

* feat(lobby): lobby chat

lobby chat support
knocking participants list updates
knocking participants conditonal checks to show message button
handle lobby chat message events
lobby messages from or to moderators only

Co-authored-by: Fecri Kaan Ulubey <f.kaan93@gmail.com>

* squash: Drop typos.

Co-authored-by: Kusi Musah Hussein <kusimusah@gmail.com>
Co-authored-by: Fecri Kaan Ulubey <f.kaan93@gmail.com>
Co-authored-by: Дамян Минков <damencho@jitsi.org>

Update video thumbnail design
Update design of indicators
In filmstrip view move Screen Sharing indicator to the top
Removed dominant speaker indicator
Use ContextMenu component for the connection stats popover
Combine Remove video menu and Meeting participant context menu into one component
Moved some styles from SCSS to JSS
Fix mobile avatars too big
Fix mobile horizontal scroll
Created button for Send to breakout room action

* In order to be able to customize the background of the chat
it had not be displayed inside of a dialog. This also removes
the need to extensively use 'TouchmoveHack' component.

* Adds the ability to change panes (Chat vs Polls) using the keyboard.

* Adds accessibility attributes to panes.

* feat(prejoin) move invite to toolbar section

* feat(premeeting) redesign prejoin and lobby screens

* code review changes

* fix prejoin flicker and avatar id

* fix password error message and native lobby dialog close position

* ensure keyboard stays open when sending messages on mobile web.

* Implement opening toolbar and participant overflows as drawers when below certain width.
* Fix dial-in copy button displaying incorrectly.

* Fix layout
* Change background color & show image

* Adding responsive to jitsi logo, buttons and hiding some part of the interface
* moving media types thresholds to variables and apply only to screen
* hide chrome extension banner on very small view
* Hide filmstrip only on desktop narrow windows

* 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.

* feat(welcome-page): Redesign.

* Style adjustments.