add neutral design as separate theme

.gitignore

Makefile

settings.py

theme-neutral/sass/hoa.scss

theme-neutral/static/fonts/FiraSans-Regular.ttf

theme-neutral/static/fonts/Geo-Regular.ttf

theme-neutral/static/img/background.svg

theme-neutral/static/img/de.png

theme-neutral/static/img/favicon.png

theme-neutral/static/img/gb.png

theme-neutral/static/img/specht.svg

theme-neutral/templates/base.html

theme-neutral/templates/page.html

theme-neutral/templates/raw.html