auto-format core markdown files (e.g. readme)

[lb-]

• clean up formatting on existing markdown files to align with prettier
• this creates a few diffs but it means that we have consistently formatted files for future changes to these root markdown files

[squash-labs]

Manage this branch in Squash

Test this branch here: https://lb-cleanupcore-markdown-files-gjn7o.squash.io

[zerolab]

The changes LGTM.
Will the next step be to lint .md with prettier in pre-commit? https://github.com/wagtail/wagtail/blob/main/.pre-commit-config.yaml#L28

[lb-]

The changes LGTM. Will the next step be to lint .md with prettier in pre-commit? https://github.com/wagtail/wagtail/blob/main/.pre-commit-config.yaml#L28

Not at the moment. My understanding is that we want to avoid too much friction for small markdown changes to be submitted via GitHub UI online.

However, I think at some point we will find it beneficial to adopt prettier for markdown also.

@thibaudcolas may have more input here.

[lb-]

Thanks @zerolab