Make GraphiQL mobile friendlier

Author: IvanGoncharov

src/renderGraphiQL.js

@@ -55,13 +55,12 @@ add "&raw" to the end of the URL within a browser.
   <meta charset="utf-8" />
   <title>GraphiQL</title>
   <meta name="robots" content="noindex" />
-  <meta name="referrer" content="origin">
+  <meta name="referrer" content="origin" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
   <style>
     body {
-      height: 100%;
       margin: 0;
       overflow: hidden;
-      width: 100%;
     }
     #graphiql {
       height: 100vh;