This reverts commit 432d07c2ad.

* Changed render mode to standard compliant and adjusted CSS accordantly.

* Fixed HTML errors, removed XHTML reminiscences and whitespace.

* Added doctype and fixed a few HTML errors.

* The input field speakerStatsSearch overflows the dialog box. Added missing box-sizing.

Co-authored-by: Bo Frederiksen <bo.frederiksen@semaphor.dk>

* feat(welcome): new design

* squash: update strings

* squash: copy/paste error?

* squash: remove welcome page disabling checks

* squash: change strings again

* squash: background var

* squash: title and desc css as variables