Background

• discussion on Discord and GitHub Which Installation should I do? #3918
• https://www.youtube.com/watch?v=s5_dtRoFYyU&feature=youtu.be&t=368

Tag to use for your PR
[Install]

• Remove unnecessary stuff
• lead new users to Hass.io, if they reach limitations they should check the alternatives

Todo

• restructure navigation bar/ sidebar
• what are the limitations of hass.io, what isn't working