Extra guides for RaspiBolt

Additional tutorials for RaspiBolt.

• JoinMarket on the RaspiBolt v1/v2 (for RaspiBolt v3 see JoinMarket bonus guide on raspibolt.org)

• SSHD as a Hidden Service with Tor on a RaspiBolt (for RaspiBolt v3 see Privacy section on base guide, although it's similar)

• Random notes about installing RaspiBolt on Odroid HC4 [device]