Implement Sass (#568)

* Move all images to assets/img

* Move all scripts to assets/js

* Move all webfonts to assets/webfonts

* Move all files to assets/files

* Move css to assets/css and add imports

* Adjust all references to assets folder

* Fix tor icon path

* Rewrite custom css to sass and add variables

* Change ?v on style.css to 5.

* Enable Sass minification

* Remove CryptoPaper-full.7z

_config.yml

@@ -18,6 +18,8 @@ description: >- # this means to ignore newlines until "baseurl:"
   You are being watched! Knowledge, encryption and privacy tools to protect you against global mass surveillance.
 baseurl: "" # the subpath of your site, e.g. /blog
 url: "" # the base hostname & protocol for your site, e.g. http://example.com
+sass:
+  style: compressed
 
 # Build settings
 # markdown: kramdown