revert back demo changes

Author: IvanGoncharov

demo/index.html

@@ -114,10 +114,26 @@
     <script type="module">
       // FIXME: switch to import
       const { renderVoyager, voyagerIntrospectionQuery } = GraphQLVoyager;
+      const PRESETS = {
+        'Star Wars': await fetchPreset('swapi'),
+        Yelp: await fetchPreset('yelp'),
+        'Shopify Storefront': await fetchPreset('shopify'),
+        GitHub: await fetchPreset('github'),
+      };
+
+      const defaultPreset = PRESETS['Star Wars'];
+
+      const searchParams = new URLSearchParams(window.location.search);
+      const url = searchParams.get('url');
+      const withCredentials = searchParams.get('withCredentials');
+
+      const introspection =
+        url != null ? fetchIntrospection(url, withCredentials) : defaultPreset;
 
       renderVoyager(document.getElementById('root'), {
-        introspection: await fetchPreset('github'),
-        allowToChangeSchema: false,
+        introspection,
+        introspectionPresets: PRESETS,
+        allowToChangeSchema: true,
         hideVoyagerLogo: false,
       });
 
@@ -144,6 +160,63 @@
     <main id="root">
       <h1 style="text-align: center; color: #5d7e86">Loading...</h1>
     </main>
+    <a
+      href="https://github.com/APIs-guru/graphql-voyager"
+      class="github-corner"
+      aria-label="View source on Github"
+      ><svg
+        width="80"
+        height="80"
+        viewBox="0 0 250 250"
+        style="
+          fill: #5d7e86;
+          color: #fff;
+          position: absolute;
+          top: 0;
+          border: 0;
+          right: 0;
+        "
+        aria-hidden="true"
+      >
+        <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
+        <path
+          d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2"
+          fill="currentColor"
+          style="transform-origin: 130px 106px"
+          class="octo-arm"
+        ></path>
+        <path
+          d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z"
+          fill="currentColor"
+          class="octo-body"
+        ></path></svg></a
+    ><style>
+      .github-corner:hover .octo-arm {
+        animation: octocat-wave 560ms ease-in-out;
+      }
+      @keyframes octocat-wave {
+        0%,
+        100% {
+          transform: rotate(0);
+        }
+        20%,
+        60% {
+          transform: rotate(-25deg);
+        }
+        40%,
+        80% {
+          transform: rotate(10deg);
+        }
+      }
+      @media (max-width: 500px) {
+        .github-corner:hover .octo-arm {
+          animation: none;
+        }
+        .github-corner .octo-arm {
+          animation: octocat-wave 560ms ease-in-out;
+        }
+      }
+    </style>
     <div id="mobile-warning">
       <h1>Best served on bigger screen sizes</h1>
       <small>