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>

bookwyrm/static/css/vendor/bulma/sass/layout/section.sass

@@ -0,0 +1,17 @@
+@import "../utilities/mixins"
+
+$section-padding: 3rem 1.5rem !default
+$section-padding-desktop: 3rem 3rem !default
+$section-padding-medium: 9rem 4.5rem !default
+$section-padding-large: 18rem 6rem !default
+
+.section
+  padding: $section-padding
+  // Responsiveness
+  +desktop
+    padding: $section-padding-desktop
+    // Sizes
+    &.is-medium
+      padding: $section-padding-medium
+    &.is-large
+      padding: $section-padding-large