Added Table of Contents and made CSS pretty again

Signed-off-by: Simon Kraft <simon@krafit.de>
Moved /images/ and /js/ to /assets/

Signed-off-by: Simon Kraft <simon@krafit.de>
Removed CSS and JS from header and footer - enqueued them properly

Signed-off-by: Simon Kraft <simon@krafit.de>
Removed /fonts/

Signed-off-by: Simon Kraft <simon@krafit.de>
Replaced "shaken" with "krafit_dokumentor"

Signed-off-by: Simon Kraft <simon@krafit.de>
Translation Update

* Added Textdomain
* added /languages/ folder and .pot file
* made several strings translatable

Signed-off-by: Simon Kraft <simon@krafit.de>