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/elements/box.sass

@@ -0,0 +1,26 @@
+@import "../utilities/mixins"
+
+$box-color: $text !default
+$box-background-color: $scheme-main !default
+$box-radius: $radius-large !default
+$box-shadow: $shadow !default
+$box-padding: 1.25rem !default
+
+$box-link-hover-shadow: 0 0.5em 1em -0.125em rgba($scheme-invert, 0.1), 0 0 0 1px $link !default
+$box-link-active-shadow: inset 0 1px 2px rgba($scheme-invert, 0.2), 0 0 0 1px $link !default
+
+.box
+  @extend %block
+  background-color: $box-background-color
+  border-radius: $box-radius
+  box-shadow: $box-shadow
+  color: $box-color
+  display: block
+  padding: $box-padding
+
+a.box
+  &:hover,
+  &:focus
+    box-shadow: $box-link-hover-shadow
+  &:active
+    box-shadow: $box-link-active-shadow