Without the proxy_http_version and proxy_header upgrades an the nginx subdomain setup generates socket errors on the login page. This makes that users can't login. Adding the websocket lines both to the "/" location as well as the "/api/websocket" location solves the issue.
Solution copied from: KickHackerz, mar 1 answer on https://community.home-assistant.io/t/ngnix-so-confused-doing-something-wrong/12736/3.
Before finding this guide, I ran into the Port 80 problem described in this page (likely blocked by ISP) and [posted about it in the LetsEncrypt forums](https://community.letsencrypt.org/t/help-with-standalone-certbot-failed-to-bind-to-80-using-ipv4/37701/8). While this excellent guide helped me circumvent that immediate issue, a certbot engineer suggested an alternate method for automated cert renewal that did not require manually changing port mapping every time a cert needed to be renewed.
In short, he suggested using a TLS challenge rather than HTTP, so that the Let's Encrypt CA would bind port 443 externally, and specify certbot to bind to port 8123 internally for certificate renewal. He also added that pre- and post-hooks could be passed to certbot so that HA could be stopped/started and port 8123 could be freed for cert renewal.
I have verified that this method works in a dry run on my own HA setup and modified step 8 with some suggested documentation
* Update nginx docs
Added step to remove passphrase from self-signed cert private key.
Removed http block since enabled sites now are included inside the http block in modern nginx configs
* Update nginx.markdown
Added note about sites-available directory in RPM-based distros (and possibly others)
* Improve backup github doc
Unignore .travis.yaml, which is referenced later in the document to set up CI testing on push.
* Fix extension on .travis.yml
It's .travis.yml and not .travis.yAml
* Updated apiai logo
* Updated Api.ai logo
The current logo was not visible against our white background (on the
components page) or the gray background (elsewhere on the website).
* Added group notifications instructions
Added instructions for sending notifications to multiple phones
* Link notification group
