RST doc strings?

I like what you're doing here. A well thought out doc system is desperately needed in the CL ecosystem, rather than the dozen half-baked ones we have now.

As far as mark-up format, RST seems a richer choice than MD. Are there plans to implement MD and a Sphinx converter or domain? I'm aware of [cl-domain](https://sr.ht/~rsl/sphinxcontrib-cldomain/), however its license isn't compatible with commercial use and anything GNU isn't an option for our projects.