Add link to known mirrors

src/App.svelte

@@ -15,7 +15,10 @@
   }
 </script>
 
-<h3>Mirror URL</h3>
+<div class="mirror-url-container">
+    <h3>Mirror URL</h3>
+    <a href="https://git.sofiaritz.com/GFonts/gfonts-interface/issues/2">Known mirrors</a>
+</div>
 <input bind:value={mirror_input} type="url">
 
 <h3>Google Fonts URL</h3>
@@ -23,7 +26,6 @@
 
 <button on:click={transform}>Transform</button>
 
-
 {#await output}
 {:then v}
     {#if v != null}
@@ -32,3 +34,12 @@
 {:catch e}
     <div>Error :( {e}</div>
 {/await}
+
+<style>
+    .mirror-url-container {
+        display: flex;
+        flex-direction: row;
+        align-items: center;
+        gap: 16px;
+    }
+</style>