Update testing steps.
Update testing steps.


Instructions for setting up a self-contained local Bisq network on Bitcoin regtest have been updated. 
`dev-setup.md` is deprecated. `Makefile` is new new version. 

Reference: https://github.com/bisq-network/bisq/blob/master/docs/README.md
bitsquare/bitsquare,bisq-network/exchange,bisq-network/exchange,bitsquare/bitsquare