Automation of CSS compilation, fixed .gitignore build issue

The grabbing of dependencies and compilation of SCSS can now simply be
done with a:

poetry run task compile-css

before a:

poetry build

When building from source. The issue where the .gitignore had to be
removed before building has been fixed, too.

scss/bs4/compile.sh

@@ -1,10 +0,0 @@
-#!/bin/bash
-css_file=$(echo $1 | sed 's/scss/css/g')
-min_file=$(echo $1 | sed 's/scss/min.css/g')
-sassc -t expanded -p 6 $1 $css_file
-echo "Compiled."
-postcss $css_file --replace --use autoprefixer
-echo "Prefixed."
-echo "Written to $css_file."
-cleancss --level 1 --format breakWith=lf --source-map --source-map-inline-sources --output $min_file $css_file
-echo "Minified version written to $min_file."