feat(nix): nix and back again

I tried Nix, but it had too many downsides so I removed it.

1. Didn't like that all files are immutable and simple config changes
need a complete rebuild.
2. Setting up a new Mac didn't work as smoothly as promised. Not worth
the effort.
3. It sucked a lot to always have to type in the password twice on each
darwin-rebuild
4. It solves problems I never had.

.ack

@@ -0,0 +1,32 @@
+# group the results by file
+--group
+
+# only search case-sensitiv with mixed case
+--smart-case
+
+# follow symlinks
+--follow
+
+# Colorful output
+--color
+
+# Ignore directories
+--ignore-dir=vendor
+--ignore-dir=log
+--ignore-dir=tmp
+--ignore-dir=gems
+--ignore-dir=node_modules
+--ignore-dir=bower_components
+
+# Add file types
+--type-set=css=.css,.less,.scss,.styl
+--type-set=html=.html,.mustache,.handlebars,.tmpl
+--type-set=json=.json
+--type-set=less=.less
+--type-set=md=.markdown,.md
+--type-set=sass=.sass,.scss
+--type-set=styl=.styl
+--type-set=style=.scss,.sass,.styl,.less,.css
+--type-set=svg=.svg
+--type-set=ts=.ts
+