update documentation to pull from the jsDelivr CDN

Locate the documentation page containing the listed React, jQuery, Opal, and Hyperstack script tags, then review how its CDN URLs are maintained. Update the referenced scripts to use jsDelivr and verify that the documented page still loads all required dependencies.

<!-- React and JQuery -->
<script crossorigin src="https://unpkg.com/react@16.8.6/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@16.8.6/umd/react-dom.production.min.js"></script>
<script crossorigin src="https://unpkg.com/create-react-class@15.6.3/create-react-class.min.js"></script>
<script crossorigin src="https://unpkg.com/react-router@4.3.1/umd/react-router.min.js"></script>
<script crossorigin src="https://unpkg.com/react-router-dom@4.3.1/umd/react-router-dom.min.js"></script>
<script crossorigin src="https://unpkg.com/history@4.10.1/umd/history.min.js"></script>
<script crossorigin src="https://unpkg.com/react_ujs@2.6.0/react_ujs/dist/react_ujs.js"></script>
<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>

<!-- Opal -->
<script src="https://cdn.jsdelivr.net/gh/hyperstack-org/hyperstack-js@master/dist/opal.min.js"></script>

<!-- Hyperstack -->
<script src="https://cdn.jsdelivr.net/gh/hyperstack-org/hyperstack-js@0.1/dist/hyperstack.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/hyperstack-org/hyperstack-js@0.1/dist/hyper-router.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/hyperstack-org/hyperstack-js@0.1/dist/hyperstack-compiler.min.js"></script>
<script src="https://raw.githubusercontent.com/hyperstack-org/hyperstack/edge/ruby/hyper-component/lib/hyperstack/ext/component/element.rb" type='text/ruby'></script>