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/post/completion.zsh

@@ -0,0 +1,18 @@
+# load our own completion functions
+fpath=(~/.zsh/completion-scripts /usr/local/share/zsh/site-functions $fpath)
+
+# completion; use cache if updated within 24h
+autoload -Uz compinit
+if [[ -n $HOME/.zcompdump(#qN.mh+24) ]]; then
+  compinit -d $HOME/.zcompdump;
+else
+  compinit -C;
+fi;
+
+# disable zsh bundled function mtools command mcd
+# which causes a conflict.
+compdef -d mcd
+
+## case-insensitive (all), partial-word and then substring completion
+zstyle ':completion:*' matcher-list '' 'm:{a-zA-Z}={A-Za-z}' \
+  'r:|[._-]=* r:|=*' 'l:|=* r:|=*'