Migrate netlify-cms-www site into this repo (#860)

* Add frontmatter to docs files (prep to move)

* Move docs into position for website migration

* Migrate website from netlify-cms-www

Some modifications, including most of the changes in https://github.com/netlify/netlify-cms-www/pull/58 (previously reverted).

Also updated the readme and added hugo-bin for quicker onboarding of new docs contributors.

* Remove netlify.toml

This allows separate build commands for cms-demo and netlifycms.org.

* Remove website/netlify.toml

May re-add later, but it's not doing anything for now.

* Remove unused content file

website/site/layouts/pages/community.html

@@ -0,0 +1,38 @@
+{{ partial "header" . }}
+
+<div class="community page">
+  <section class="hero">
+    <div class="contained">
+
+      <div class="hero-copy">
+        <h1 class="headline">{{ .Params.headline | markdownify }}</h1>
+        <h2 class="subhead">{{ .Params.subhead | markdownify }}</h2>
+        <h3 class="ctas"><ul><li>{{ .Params.primarycta | markdownify }}</li></ul></h3>
+      </div>
+
+      <div class="calendar-cta">
+        <h2>{{ .Params.upcomingevent.hook }}</h2>
+        <div class="calendar">
+          <div class="month"></div>
+          <div class="day"></div>
+        </div>
+        <h2><strong></strong> at <strong></strong></h2>
+        <div class="cal-cta">{{ .Params.primarycta | markdownify }}</div>
+      </div>
+
+    </div>
+  </section>
+
+  <section class="how-it-works clearfix">
+    <div class="contained">
+      <div class="half">
+        <h4 class="section-label">How it works</h4>
+        <p>{{ .Params.howitworks | markdownify }}</p>
+        <h4 class="section-label">How to join</h4>
+        <p>{{ .Params.howtojoin | markdownify }}</p>
+      </div>
+    </div>
+  </section>
+</div>
+
+{{ partial "footer" . }}