Add Prettier

[reckter]

Changes

• Adds .editorconfig with prettier defaults
• Adds npm run lint:fix for prettier autofixes
• Adds npm run lint:check for checking
• Add lint:fix to CI run

Note

• This does a lot of changes to Markdown files, I don't know enough about how they are used here, to understand if that is problematic. If needed / wanted, we can just put them on the .prettierignore list
• I've changed no prettier default setting. (I don't like all of the defaults myself, but it's mostly bikeshedding anyway so I thought it best to leave it as is)

[TodePond]

maybe its worth only committing the changed files in this PR? and then applying the format in a stacked or followup PR, so that it doesnt crash the github change viewer haha

[reckter]

@TodePond Removed the actual formating changes for now, Can also add them, after approval to this one. (the CI should fail, because of the new linting check). We could also disable the CI, and do the formating in a different PR, I'm fine either way

[TodePond]

looks good to me! if people have trouble with this we could always relax the linting rule

[munshkr]

Thanks! I disabled the lint command on CI for now, we should re-enable it again when re-formatting everything in the second PR.