Add formatter

[mark-wiemer]

Greatly reduces decision fatigue while writing documents :)

• CI fails if any file is not formatted
• Single well-documented command can be used by contributors to format the entire repo
• Files can easily be ignored or unignored

[wsor4035]

ci shouldnt be added till #15 is done

[mark-wiemer]

Fair enough

[appgurueu]

Side note, it's also possible to have actions that directly commit to the working branches of PRs. I feel this could be neat to make the process smoother.

[mark-wiemer]

Yes, as long as the auto-committed code is thoroughly reviewed! Of course, that should apply to human-written code, but I think we've all had our oopsies with that. But yeah, I'm in favor of experimenting with this

[appgurueu]

A correct formatter should not require review of its output, it should only make changes that don't change anything semantically (like converting - to * in Markdown lists for example).

[mark-wiemer]

In my book, any changes to any files require review--you just never know!! But yes, formatters like Prettier should be fine, but we should always review as we're responsible for ensuring the stuff we merge and deploy is good, we can never "blame the formatter"

[grorp]

Prettier is nice

ci shouldnt be added till #15 is done

Why not? Wouldn't having automatic formatting make importing pages easier, since you'd have one thing less to worry about?