treewide: begin restructuring the module tree

modules/plugins/lsp/lsp-signature/config.nix

@@ -0,0 +1,29 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib.modules) mkIf;
+  inherit (lib.nvim.dag) entryAnywhere;
+  inherit (lib.nvim.lua) toLuaObject;
+
+  cfg = config.vim.lsp;
+in {
+  config = mkIf (cfg.enable && cfg.lspSignature.enable) {
+    vim = {
+      startPlugins = [
+        "lsp-signature"
+      ];
+
+      lsp.lspSignature.setupOpts = {
+        bind = config.vim.ui.borders.plugins.lsp-signature.enable;
+        handler_opts.border = config.vim.ui.borders.plugins.lsp-signature.style;
+      };
+
+      luaConfigRC.lsp-signature = entryAnywhere ''
+        -- Enable lsp signature viewer
+        require("lsp_signature").setup(${toLuaObject cfg.lspSignature.setupOpts})
+      '';
+    };
+  };
+}