Some dev improvements:
* Add .editorconfig config file https://editorconfig.org/
* move the singleQuote spec into .editorconfig and add old .changesets/*.md to .prettierignore so that we don't incorrectly reformat new changeset files to single quote from the double quote which they can be autogenerated with in github
* .gitignore Ignore emacs chaff files
* Add `yarn format:head` a convenience command to run prettier against just those files in the head commit
* Some mention of `yarn format` in the docs
* Fix some test html closing tags; authoring mistakes, rather than deliberately malformed html — picked up by an explicit `yarn prettier --write '**/*.html'`
Hello and welcome! This folder has been automatically generated by @changesets/cli, a build tool that works
with multi-package repos, or single-package repos to help you version and publish your code. You can
find the full documentation for it in our repository
We have a quick list of common questions to get you started engaging with this project in
our documentation
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