refactor: combine with Ubuntu Provisioning repo

Combine with this repository with https://github.com/opdavies/ubuntu-provisioning
so that everything can be managed in one place, and add a role for each
piece of software.

roles/zsh/files/.zsh/configs/git.zsh

@@ -0,0 +1,10 @@
+# No arguments: `git status`
+# With arguments: acts like `git`
+g() {
+  if [[ $# > 0 ]];
+  then
+    git $@
+  else
+    git status --short --branch
+  fi
+}