feat(a11y): added headings across the app for easier screen reader nav

Remove unused icons
Remove fill none from icons
Rename some icons

* 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.

* Add different text when disablePolls is enabled/disabled #9890

* Add different text when disablePolls is enabled/disabled v2 #9890

* Make Jitsi WCAG 2.1 compliant

* Fixed password form keypress handling

* Added keypress handler to name form

* Removed unneccessary dom query

* Fixed mouse hove style

* Removed obsolete css rules

* accessibilty background feature

* Merge remote-tracking branch 'upstream/master' into nic/fix/merge-conflicts

* fix error

* add german translation

* Fixed merge issue

* Add id prop back to device selection

* Fixed lockfile

Co-authored-by: AHMAD KADRI <52747422+ahmadkadri@users.noreply.github.com>

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

* Fix toolbox buttons not displaying properly when chat is open.
* Open chat in fullscreen dialog past custom thresholds when mobile/desktop toolbox would become unusable due to chat
* Remove mobile chat check when displaying toolbox