Update project description
Handle staging modules that aren't in registry
Rework version setter for staging

Start at 0.0.0 and simplify increment logic
Document current commands.
slt-changelog: ensure releases are chronological

Without accounting for tag date, v0.0.1 is a "later" tag/release than
9.9.9 because `git tag` prints them in lexicographical order.
1.1.1