add call to action to request more heatmaps by opening discussions

src/pages/index.tsx

@@ -128,7 +128,7 @@ export default function OpenSourceHeatmap() {
   return (
     <div className="w-full max-w-screen-lg mx-auto p-4">
       <h1 className="text-3xl lg:text-5xl mt-16 font-bold text-center mb-2">Hugging Face Heatmap 🤗</h1>
-      <p className="text-center text-sm mb-8">The top AI labs and model releases.</p>
+      <p className="text-center text-sm mb-8">The top AI labs and model releases. Request more heatmaps by [opening a discussion](https://huggingface.co/spaces/cfahlgren1/model-release-heatmap/discussions/new).</p>
       {isLoading ? (
         <p className="text-center">Loading...</p>
       ) : (