ESlint/Prettier fixes

[akx]

Types of changes

What types of changes does your code introduce?

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Description

I noticed the ESlint ignore file was misnamed as . eslintignore, not .eslintignore.

After that, running lint yielded some warnings, so I fixed the configuration issues that led to those.

Since the Prettier configuration was moved out of the Eslint configuration, it's now usable for other files than just JS, so I finally ran everything through Prettier, just so everything is on the same page.

[akx]

Guess not :) Closing to clean up my PR list ✌️