Minlure is a port of ArduPilot to Minnow Board connected to daughter
board. Very few of those were produced and nobody is flying with it.
It served its purpose and all the the improvements to ArduPilot remain
regardless of it not being supported anymore. Now it's just adding
maintenance work with no clear benefit, so pull the plug.
Add a new "Basic use" section so people don't get overhauled with build
instructions. They can read about the more advanced commands once they
are able to use the basic ones.
While at it, update the instructions to use the waf wrapper.