Fix the dependency mess somewhat for production

requirements-dev.txt

+libsass==0.19.4
+jsmin==2.2.2
+watchdog==0.10.2
+
+# ancient jsmin requires ancient setuptools
+setuptools<=58
+
+# binary dependencies: apt install build-essential

requirements.txt

-libsass==0.19.4
-jsmin==2.2.2
-watchdog==0.10.2

setup.py

@@ -18,9 +18,8 @@ setup(
     author_email='tim.fechner@hs-hannover.de',
     zip_safe=False,
     install_requires=[
-        'libsass==0.19.4',
-        'jsmin==3.0.0',
-        'watchdog==0.10.2'
+        # ⚠️ keep this empty because production servers don't compile sass or minimize js
+        # ⚠️ so production setup doesn't have to suffer suffer from tons of optional heavyweight compiled binary dependencies
     ],
     classifiers=[
         'Environment :: Web Environment',