decodeURIComponent is not needed any more and after adding a validation such meeting name should not happen to be stored.

* fix(invite): decode the meeting name

* squash: try to make mobile join same encoded meeting name as web

* Decodes and generated texts for share and copy meeting info.

Decodes in all cases except when it contains a space, as it will generate wrong links when pasted/shared in external applications.

* feat(welcome-page): Redesign.

* Style adjustments.