Running pre-commit with GitHub Actions now gives us more tests and coverage
Remove duplicate GitHub Actions for merge conflicts and trailing whitespace
Remove duplicate checks for markdownlint and yamllint from the GitHub Super-Linter
Add new custom pre-commit hook running with a shell script to sort alphabetically and uniquify codespell.txt
Add new pre-commit hook to check spelling with codespell
https://github.com/codespell-project/codespell
Fix spelling
* In explanation of mruby, the expression `build_config.rb` is frequently
used including official documents, so I think that it will not make sense
if the file is no longer used.
* The `MRUBY_TARGET` mechanism seems to have little improvement, so I don't
think it should be changed to avoid unnecessary confusion.
* `MRUBY_TARGET` and `MRuby.targets` represent somewhat different things,
so using the same term "target" is a bit confusing.
The mechanism that can be written short when using a file under
`build_config` (renamed from `target`) directory remains
(`build_config/${MRUBY_CONFIG}.rb` is used if the path specified
in `MRUBY_CONFIG` doesn't exist).
John Bampton