Update to (somewhat?) dendritic pattern

Heavily inspired by https://github.com/Doc-Steve/dendritic-design-with-flake-parts.

> Atomic commits? Never heard of them!

modules/programs/nixvim/_nixvim-config/plugins/lsp.nix

@@ -0,0 +1,36 @@
+{ ... }: {
+  dependencies.rust-analyzer.enable = true;
+
+  lsp = {
+    inlayHints.enable = true;
+    servers = {
+      "*" = {
+        config.capabilities.textDocument.semanticTokens.multilineTokenSupport = true;
+        config.root_markers = [
+          ".git"
+        ];
+      };
+      clangd = {
+        enable = true;
+        config.root_markers = [
+          "compile_commands.json"
+        ];
+      };
+      rust_analyzer = {
+        enable = true;
+      };
+      rnix.enable = true;
+    };
+
+    keymaps = [
+      {
+        key = "<leader>e";
+        action = "<cmd>lua vim.diagnostic.open_float()<CR>";
+        options.desc = "Open Diagnostics";
+      }
+    ];
+  };
+
+  plugins.lspconfig.enable = true;
+  plugins.clangd-extensions.enable = true;
+}