Adopt prettier

[4vanger]

It is time to adopt prettier and comb the codebase - it is way too messy atm - inconsistent indents, inconsistent style, need to insert semicolons manually.
Prettier is a solution.
Plan:

• let's discuss the config on Discord
• I've applied prettier to 3 files to show how result will look like
• after we agree on config - I'll add a single commit to apply prettier to all the codebase

Here is documentation for Prettier config - https://prettier.io/docs/en/options.html

[Aivean]

Please fix the builds.