Refactor: Cleanup and move web-assets navbar-global styles to markup script tag

Move web-assets navbar-global styles to markup script tag, accordingly
to component and web-assets instructions, to improve the component's
portability.
Part of #9

templates/custom/body_inner_pre.tmpl

@@ -686,6 +686,19 @@
   </div>
 </div>
 
+<style>
+  /* Custom styling for projects.blender.org */
+  /* Make sure to start every line with ".nav-global"
+   * so changes affect the developer navbar only. */
+
+  /* Limit navbar width on large screens. */
+  @media(min-width: 1200px) {
+    .nav-global .nav-global-container {
+      max-width: 1170px;
+    }
+  }
+</style>
+
 <script>
   // TODO: revise component pre-compiled JavaScript in web-assets
   const dropdownToggles = document.getElementsByClassName("js-dropdown-toggle");