Compiles css framework from sass (#1956)

* Compiles css framework from sass

* Adds watch commands

* Copies existing css to sass file

* Moves sass out of static path

* Removes global linter

I wasn't sure how to customize this, and it's not providing a lot of
additional value on top of the domain-specific linters

* Reverts invalid change to dockerfile

* Changes stylelint path

* Remove unused bulma files

* Properly minifies generated css

* Fixes regression in thread display

* rgba function only works with percents for whatever reason

* Hush stylelint

* Removes trailing zeros

* Compile sass in Django

Co-authored-by: Joachim <joachim.robert@protonmail.com>

* Python formatting

* Updates linter

* Updates commands

* Adds css-config file

Co-authored-by: Joachim <joachim.robert@protonmail.com>

* Stylelint fix

* Removes unused compiled bulma files

Co-authored-by: Joachim <joachim.robert@protonmail.com>

dev-tools/.stylelintrc.js

@@ -16,6 +16,7 @@ module.exports = {
         "property-no-vendor-prefix": null,
         "color-function-notation": null,
         "declaration-block-no-redundant-longhand-properties": null,
-        "no-descending-specificity": null
+        "no-descending-specificity": null,
+        "alpha-value-notation": null
     }
 };