Incorrect instruction in quickstat documentation

[rawdlite]

Hi, I think i found a bug in quickstart.md In quickstart it says:

sudo bash -c "echo ZEROTIER_CENTRAL_TOKEN > /var/lib/zerotier-one/token"

This will put just the String 'ZEROTIER_CENTRAL_TOKEN' into the token file. I guess it should read:

sudo bash -c "echo $ZEROTIER_CENTRAL_TOKEN > /var/lib/zerotier-one/token"

and before that a:

export ZEROTIER_CENTRAL_TOKEN=<token id>

is a required step.

HTH

cheers tom