[suggest ] suggest improvements for the install.sh

[LNS-MrGoodkat]

for the apt-get install add 'python3-cairo-dev' to avoid the error "Can't build; py3cairo was not found in the pkg-config search path."
and add also libdbus-1-dev for dbus-python

for:

sudo usermod -a -G bluetooth pi
sudo usermod -a -G dialout pi

replace it with:

sudo usermod -a -G bluetooth $(who -m | awk '{print $1;}')
sudo usermod -a -G dialout $(who -m | awk '{print $1;}')