restructuring for easier maintenance

- creating src packages when things can't be installed via
  actual system package
- neovim srcpkg is being worked on now

vars/nerdfonts.yml

@@ -0,0 +1,16 @@
+---
+nerdfonts:
+  - name: CascadiaCode
+    brew: caskaydia-cove
+  - name: FiraCode
+    brew: fira-code
+  - name: Hasklig
+    brew: hasklug
+  - name: Lilex
+    brew: lilex
+  - name: Monoid
+    brew: monoid
+  - name: NerdFontsSymbolsOnly
+    brew: symbols-only
+nerdfonts_system_install: false
+