Sphinx-theme-builder

- Fix Python 3.7 compatibility.
- Fix handling of missing `node` executable on system.
- Explicitly declare the LICENSE.

- Fix improper RECORD file generation.

- Try to fix improper RECORD file generation.

- Add `stb compile --production`
- Improve documentation on what the project layout is.

- Allow setting alternative theme name.
- Enable users to specify custom "additional compiled static assets".
- Present error when npm is not found.
- Present more context when deciding on using `system` nodeenv.
- Run `nodeenv` with rich traceback installed.
- Search `PATH` for executables to run in nodenv.
- Suppress exception stack from click.

- Include parent paths of compiled files, when computing files for the wheel
archive.
- Fix release version management.