renamed some files and directories that had identical filenames. Altered some nixvim plugin options. Set up gpg signing for git commits.

modules/sys/default.nix

@@ -1,3 +1,3 @@
 { inputs, nixpkgs, config, self, username, host, lib, ... }: {
-  imports = [ ./hardware ./software ./environment ];
+  imports = [ ./hardware ./software ./sysenv ];
 }