add i3wm ppa to Ubuntu

gistfile1.txt

## Update i3 repo to latest stable ppa

compare current version of i3 (website) with installed version. Ubuntu packages are usually behind. If you need to, add ubuntu ppa for i3 to get latest stable version per [instructions](https://i3wm.org/docs/repositories.html)

```
/usr/lib/apt/apt-helper download-file http://debian.sur5r.net/i3/pool/main/s/sur5r-keyring/sur5r-keyring_2018.01.30_all.deb keyring.deb SHA256:baa43dbbd7232ea2b5444cae238d53bebb9d34601cc000e82f11111b1889078a

sudo su root
dpkg -i ./keyring.deb
echo "deb http://debian.sur5r.net/i3/ $(grep '^DISTRIB_CODENAME=' /etc/lsb-release | cut -f2 -d=) universe" >> /etc/apt/sources.list.d/sur5r-i3.list
exit

sudo apt update
sudo apt upgrade
```

Exit and restart i3