Re-organisation Documentation and Getting started (#2055)

* Split MQTT documentation

* Add more details

* Move content to /docs

* Enable sidebar

* Move content to /docs

* Enable sidebar

* Move content

* Update links

* Remove wizard stuff

* Enable sidebar

* Minor changes

* Move MQTT parts to /docs

* update links

* Update links and sync content

* Fix link

* Enable sidebar

* Remove navigation

* Remove navigation and other minor updates

* Update links

* Add overview page

* Make title linkable

* Update

* Plit content

* Update links

* Rearrange content

* New getting-started section

* Add icons for docs

* Update for new structure

* Update for new structure

* Add docs navigation

* Add docs overview page

* Remove ecosystem navigation

* Add docs and remove other collections

* Move ecosystem to docs

* Remove duplicate files

* Re-add ecosystem overview

* Move to ecosystem

* Fix permission

* Update navigation

* Remove collection

* Move overview to right folder

* Move mqtt to upper level

* Move notebook to ecosystem

* Remove un-used files

* Add one more rectangle for iOS

* Move two parts back from docs and rename Run step

* Remove colon

* update getting-started section

* Add redirect

* Update

* Update navigation

source/_docs/frontend.markdown

@@ -0,0 +1,21 @@
+---
+layout: page
+title: "Frontend of Home Assistant"
+description: "Frontend of Home Assistant."
+date: 2017-02-13 12:50
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+The frontend of Home Assistant is built with [Polymer](https://www.polymer-project.org/).
+
+<p class='img'>
+  <img src='{{site_root}}/images/screenshots/ui2015.png' />
+</p>
+
+The [User Interface section](/cookbook/#user-interface) can give you some starting points to expand the frontend.
+
+If you want to work on the frontend, please refer to the [Frontend Development documentation](/developers/frontend/).
+