(chore) add two missing styles to dev tool

Author: joshgoebel

tools/developer.html

@@ -132,6 +132,8 @@ <h3>Code</h3>
           <option>monokai.css</option>
           <option>night-owl.css</option>
           <option>nord.css</option>
+          <option>nnfx.css</option>
+          <option>nnfx-dark.css</option>
           <option>obsidian.css</option>
           <option>ocean.css</option>
           <option>paraiso-dark.css</option>