modules: start breaking down core modules; simplify tree structure

modules/plugins/lsp/lightbulb/config.nix

@@ -0,0 +1,22 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib) mkIf nvim;
+
+  cfg = config.vim.lsp;
+in {
+  config = mkIf (cfg.enable && cfg.lightbulb.enable) {
+    vim.startPlugins = ["nvim-lightbulb"];
+
+    vim.configRC.lightbulb = nvim.dag.entryAnywhere ''
+      autocmd CursorHold,CursorHoldI * lua require'nvim-lightbulb'.update_lightbulb()
+    '';
+
+    vim.luaConfigRC.lightbulb = nvim.dag.entryAnywhere ''
+      -- Enable trouble diagnostics viewer
+      require'nvim-lightbulb'.setup()
+    '';
+  };
+}

modules/plugins/lsp/lightbulb/default.nix

@@ -0,0 +1,6 @@
+_: {
+  imports = [
+    ./lightbulb.nix
+    ./config.nix
+  ];
+}

modules/plugins/lsp/lightbulb/lightbulb.nix

@@ -0,0 +1,13 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib) mkEnableOption;
+in {
+  options.vim.lsp = {
+    lightbulb = {
+      enable = mkEnableOption "Lightbulb for code actions. Requires an emoji font";
+    };
+  };
+}