add link to github to demo component

docs/src/components/Demo/index.vue

@@ -20,6 +20,9 @@
         <prism :code="activeFile.content" :language="activeFile.highlight" :highlight="highlight" />
       </div>
     </div>
+    <div class="demo__link">
+      <a :href="githubUrl" target="_blank">Edit on GitHub</a>
+    </div>
   </div>
 </template>
 
@@ -81,6 +84,10 @@ export default {
     activeFile() {
       return this.files[this.currentIndex]
     },
+
+    githubUrl() {
+      return `https://github.com/ueberdosis/tiptap-next/tree/main/docs/src/demos/${this.name}`
+    },
   },
 
   mounted() {