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/progress.sass

@@ -0,0 +1,73 @@
+@import "../utilities/mixins"
+
+$progress-bar-background-color: $border-light !default
+$progress-value-background-color: $text !default
+$progress-border-radius: $radius-rounded !default
+
+$progress-indeterminate-duration: 1.5s !default
+
+$progress-colors: $colors !default
+
+.progress
+  @extend %block
+  -moz-appearance: none
+  -webkit-appearance: none
+  border: none
+  border-radius: $progress-border-radius
+  display: block
+  height: $size-normal
+  overflow: hidden
+  padding: 0
+  width: 100%
+  &::-webkit-progress-bar
+    background-color: $progress-bar-background-color
+  &::-webkit-progress-value
+    background-color: $progress-value-background-color
+  &::-moz-progress-bar
+    background-color: $progress-value-background-color
+  &::-ms-fill
+    background-color: $progress-value-background-color
+    border: none
+  // Colors
+  @each $name, $pair in $progress-colors
+    $color: nth($pair, 1)
+    &.is-#{$name}
+      &::-webkit-progress-value
+        background-color: $color
+      &::-moz-progress-bar
+        background-color: $color
+      &::-ms-fill
+        background-color: $color
+      &:indeterminate
+        background-image: linear-gradient(to right, $color 30%, $progress-bar-background-color 30%)
+
+  &:indeterminate
+    animation-duration: $progress-indeterminate-duration
+    animation-iteration-count: infinite
+    animation-name: moveIndeterminate
+    animation-timing-function: linear
+    background-color: $progress-bar-background-color
+    background-image: linear-gradient(to right, $text 30%, $progress-bar-background-color 30%)
+    background-position: top left
+    background-repeat: no-repeat
+    background-size: 150% 150%
+    &::-webkit-progress-bar
+      background-color: transparent
+    &::-moz-progress-bar
+      background-color: transparent
+    &::-ms-fill
+      animation-name: none
+
+  // Sizes
+  &.is-small
+    height: $size-small
+  &.is-medium
+    height: $size-medium
+  &.is-large
+    height: $size-large
+
+@keyframes moveIndeterminate
+  from
+    background-position: 200% 0
+  to
+    background-position: -200% 0