Update CID spec link in index.html

Author: 2color

index.html

@@ -31,7 +31,7 @@ <h1 class='f3 fw2 montserrat aqua ttu'>CID Inspector</h1>
   <section class='pv4 pl2 pl5-l'>
     <div class='pt2 measure-wide cf pr2 pr0-l'>
       <a class='gray hover-aqua link underline fr ml3' href="https://proto.school/#/anatomy-of-a-cid" target="_blank">Tutorial</a>
-      <a class='gray hover-aqua link underline fr ml3' href="https://github.com/ipld/cid" target="_blank">Spec</a>
+      <a class='gray hover-aqua link underline fr ml3' href="https://specs.ipfs.tech/cid/" target="_blank">Spec</a>
       <a class='gray hover-aqua link underline fr' href="https://docs.ipfs.tech/concepts/content-addressing/#identifier-formats" target="_blank">Docs</a>
       <label for="input-cid" class='db pb2 w-100 tracked ttu f5 teal'>CID</label>
       <input id="input-cid" type="text" placeholder="Paste a CID here to break it down!" class='db w-100 ph2 pv2 monospace input-reset ba b--black-20 border-box' />