Readme refresh.
Readme refresh.

Drop example that was long out of date, talk some about why atlases are cool.

Should have an example, but want to give that all due attention in its own time.

Signed-off-by: Eric Myhre <2346ad27d7568ba9896f1b7da6b5991251debdf2@exultant.us>

polydawn/go-xlate,polydawn/go-xlate,polydawn/refmt,polydawn/refmt