Update Hass.io docs

source/hassio/index.markdown

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-Hass.io turns your Raspberry Pi (or other device) into the ultimate Home Automation hub. It takes away all the hassle of installing Home Assistant and related applications and keeping them up to date. Updates to the operating system, Home Assistant, and any add-ons can be done via the Home Assistant UI with a single click.
+Hass.io turns your Raspberry Pi (or other device) into the ultimate home automation hub powered by Home Assistant. With Hass.io you can focus on integrating your devices and writing automations.
+
+[Go to the installation instructions »][install]
+
+The advantages of using Hass.io:
+
+ - Free and open source
+ - Optimized for the Raspberry Pi
+ - 100% local home automation
+ - Easy installation and updates (powered by [ResinOS] and [Docker])
+ - Management user interface integrated into Home Assistant
+ - Easily create and restore full backups of your whole configuration.
+ - One click install of many popular add-ons including voice assistant via [Snips.ai], encryption via [Let's Encrypt] and dynamic DNS via [Duck DNS].<br><br>[Browse available add-ons &raquo;][all]
+ - Active community that is helpful and sharing add-ons including AppDaemon, Homebridge and InfluxDB.<br><br>[Browse the forums &raquo;][forums]<br>[Join the Hass.io chat &raquo;][chat]<br>[Browse community add-on repositories &raquo;][comm-add-ons]
+
+<p class='img'>
+<img src='/images/hassio/screenshots/dashboard.png'>
+Hass.io dashboard
+</p>
+
+[Snips.ai]: /addons/snips/
+[Let's Encrypt]: /addons/lets_encrypt/
+[Duck DNS]: /addons/duckdns/
+[forums]: https://community.home-assistant.io/c/hass-io
+[comm-add-ons]: https://community.home-assistant.io/tags/hassio-repository
+[all]: /addons/
+[chat]: https://discord.gg/K3UVxJd
+[ResinOS]: https://resinos.io/
+[Docker]: https://www.docker.com/
+[install]: /hassio/installation/