This takes the Plasma Mobile website as a base and transforms it into a
Plasma Bigscreen one. To keep the history clear and for Bigscreen
relevant changes only this is setup as a new repository rather than
forking the old one.
It removes unused images and all blog posts (Plasma Bigscreen doesn't
have blog posts yet, but should be easy to add now for the future).
It also changes all texts to be relevant for Bigscreen rather than Mobile.

Translations are also removed for now since almost all text has changed,
and thus requires translations to be redone.

What has to be done still:

- fix up Markdown codeblocks to be readable, ones that define what file
  type they are displaying are completely unreadable currently
- add some proper screenshots for the screenshot (and other) page(s)
- probably add relevant info from the current site that I might have
  missed