wave: Try to improve README markup

!-1: Try to improve README markup

Move from .org to .md for SourceHut

Add wave generator

Add gitignore leading slash

Add random DNA generator

Cut !-1 down to 104B

  * Abuse main() signature.

  * Save input value for single printf() call.

Add !-1 file sizes to README

Shorten forgotten modulus negations

Demote !-1 README sections

Ignore !-1 binaries

Three attempts at inverse factorial

Initial commit