fix user privacy violation (#280)

load semantic.min.css from tools-static.wmflabs.org
instead of cdnjs.cloudflare.com

Co-authored-by: Ndibe Raymond Olisaemeka <rolisaemeka-ctr@wikimedia.org>

Author: NdibeRaymond

frontend/WikiContrib-Frontend/public/index.html

@@ -12,7 +12,7 @@
     -->
   <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
   <!-- semantic.min.css has a syntax that breaks code when important through javascript. So instead of javascript import, we link it here -->
-  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.4.1/semantic.min.css" integrity="sha512-8bHTC73gkZ7rZ7vpqUQThUDhqcNFyYi2xgDgPDHc+GXVGHXq+xPjynxIopALmOPqzo9JZj0k6OqqewdGO3EsrQ==" crossorigin="anonymous" referrerpolicy="no-referrer" />
+  <link rel="stylesheet" href="https://tools-static.wmflabs.org/cdnjs/ajax/libs/semantic-ui/2.4.1/semantic.min.css" crossorigin="anonymous" referrerpolicy="no-referrer" />
   <!--
       Notice the use of %PUBLIC_URL% in the tags above.
       It will be replaced with the URL of the `public` folder during the build.