[development] More TS dev fixes, adds direnv. Fixes some markdown rendering.

home-manager/features/development/markdown.nix

@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+{
+  home.packages = with pkgs; [
+    markdownlint-cli2 # linter
+  ];
+}

home-manager/features/development/typescript.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+{
+  home.packages = with pkgs; [
+    vtsls  # Language Server
+    eslint # Linter
+    nodePackages.prettier # Formatter
+    tailwindcss-language-server # Language server for tailwind CSS
+  ];
+}