Prettier config, standardized import-sort, dependency updates

[fatso83]

Makes all formatting consistent

[ethanresnick]

I'm happy to add in prettier, but only with the default config (i.e., no .prettierrc). My take on prettier is that a big part of its value comes from helping teams/projects avoid pointless fights over style — but adding in a config file just reopens those fights (now you're fighting over what should go in the config).

[fatso83]

Sure, I have Prettier run on save in vim, and that resulted in lots of changes, so I tried adding a configuration to minimize the amount of changes (single vs double quotes, for instance).

I could change this to remove the configuration and add a Husky commit hook that runs Prettier instead? This would result in lots more changes though.

[fatso83]

Doing it.

[fatso83]

Did some smaller chores in the same PR (see commit list).

[ethanresnick]

Looks great overall! See comments

[fatso83]

Fixed comment