Re-organise to use a bare repo

Re-organise to use a bare repo, e.g.
https://www.atlassian.com/git/tutorials/dotfiles.

.zshrc

@@ -0,0 +1,37 @@
+# Enable extended globbing for use in _load_settings()
+setopt extendedglob
+
+# extra files in ~/.zsh/configs/pre , ~/.zsh/configs , and ~/.zsh/configs/post
+# these are loaded first, second, and third, respectively.
+_load_settings() {
+  _dir="$1"
+  if [ -d "$_dir" ]; then
+    if [ -d "$_dir/pre" ]; then
+      for config in "$_dir"/pre/**/*~*.zwc(N-.); do
+        . $config
+      done
+    fi
+
+    for config in "$_dir"/**/*(N-.); do
+      case "$config" in
+        "$_dir"/(pre|post)/*|*.zwc)
+          :
+          ;;
+        *)
+          . $config
+          ;;
+      esac
+    done
+
+    if [ -d "$_dir/post" ]; then
+      for config in "$_dir"/post/**/*~*.zwc(N-.); do
+        . $config
+      done
+    fi
+  fi
+}
+
+_load_settings "$HOME/.zsh/configs"
+
+# Local config
+[[ -f ~/.zshrc.local ]] && source ~/.zshrc.local