Add js framework stub

Relates to https://github.com/ebiwd/EBI-Framework/issues/115 and
https://github.com/ebiwd/EBI-Framework/issues/77

content/websites/meta-patterns/js-frameworks.html

+---
+meta-title: Structure
+title: Building EMBL-EBI sites with JavaScript frameworks
+description: If you're building a site using AngularJS, React, Vue, Ember, Meteor or the like, here are some helpful tips.
+cta: If you're building a site using AngularJS, React, Vue, Ember, Meteor or the like, here are some helpful tips.
+hero-class: hero-building-blocks
+hero: true
+filter-nav: false
+filter-dropdowns: false
+layout: static
+pagetype: meta-pattern
+location: js-frameworks.html
+---
+
+{{#markdown}}
+{{cta}}
+<div class="callout table-of-contents"><h3>On this page</h3><p>Loading...</p></div>
+
+### Work in progress
+
+[For now see this Google Doc](https://docs.google.com/document/d/1pqZE2z9pSKqklUwb_83JexkgbmJilBQlLhCASG-CN64/) (contributions and suggestions welcome!)
+{{/markdown}}