refactor: change to litterate config

Configuration is now held by the `.org` files. All `.nix` files are
tangled from the org-mode files.

flake.nix

@@ -1,7 +1,7 @@
 # DO-NOT-EDIT. This file was auto-generated using github:denful/flake-file.
 # Use `nix run .#write-flake` to regenerate it.
 {
-  description = "NixOS and Home Manager configuration of phundrak";
+  description = "NixOS and Home Manager configuration of P'undrak";
 
   outputs = inputs: inputs.flake-parts.lib.mkFlake { inherit inputs; } (inputs.import-tree ./modules);
 
@@ -25,7 +25,7 @@
 
   inputs = {
     caelestia-shell = {
-      url = "github:caelestia-dots/shell";
+      url = "github:caelestia-dots/shell?ref=stable";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     flake-file.url = "github:vic/flake-file";