add lsp, update neo-tree config and add bufferline

config/plugins/ui/bufferline.nix

@@ -0,0 +1,90 @@
+{ config, ... }: {
+
+  plugins = {
+    bufferline = {
+    enable = true;
+    };
+  };
+  keymaps = [
+    {
+      mode = "n";
+      key = "<leader>]b";
+      action = "<cmd>BufferLineCycleNext<cr>";
+      options = {
+        desc = "Cycle to next buffer";
+      };
+    }
+  
+    {
+      mode = "n";
+      key = "<leader>[b";
+      action = "<cmd>BufferLineCyclePrev<cr>";
+      options = {
+        desc = "Cycle to previous buffer";
+      };
+    }
+
+    {
+      mode = "n";
+      key = "<S-l>";
+      action = "<cmd>BufferLineCycleNext<cr>";
+      options = {
+        desc = "Cycle to next buffer";
+      };
+    }
+
+    {
+      mode = "n";
+      key = "<S-h>";
+      action = "<cmd>BufferLineCyclePrev<cr>";
+      options = {
+        desc = "Cycle to previous buffer";
+      };
+    }
+
+    {
+      mode = "n";
+      key = "<leader>bd";
+      action = "<cmd>bdelete<cr>";
+      options = {
+        desc = "Delete buffer";
+      };
+    }
+
+    {
+      mode = "n";
+      key = "<leader>bl";
+      action = "<cmd>BufferLineCloseLeft<cr>";
+      options = {
+        desc = "Delete buffers to the left";
+      };
+    }
+
+    {
+      mode = "n";
+      key = "<leader>bo";
+      action = "<cmd>BufferLineCloseOthers<cr>";
+      options = {
+        desc = "Delete other buffers";
+      };
+    }
+
+    {
+      mode = "n";
+      key = "<leader>bp";
+      action = "<cmd>BufferLineTogglePin<cr>";
+      options = {
+        desc = "Toggle pin";
+      };
+    }
+
+    {
+      mode = "n";
+      key = "<leader>bP";
+      action = "<Cmd>BufferLineGroupClose ungrouped<CR>";
+      options = {
+        desc = "Delete non-pinned buffers";
+      };
+    }
+  ];
+}