Update configuration + custom logic

[samouri]

With the recent updates to Prettier, we can remove some custom hacks from the code:

1. --require-pragma, --insert-pragma
2. .prettierc

Also, while we are updating these things, should we change printWidth to 80?

cc @nylen

[nylen]

should we change printWidth to 80?

Personally I would say yes, and the prettier documentation agrees:

For readability we recommend against using more than 80 characters: [...]

However, I think some people prefer longer lines. As a compromise I would suggest 90 characters + increasing the tab width from 2 to 4.

[ntwb]

WordPress recommends 80 characters, I'm going to go with that for now and see how that looks for Gutenberg and WordPress core.

https://make.wordpress.org/core/handbook/best-practices/coding-standards/javascript/#spacing

"Lines should usually be no longer than 80 characters, and should not exceed 100 (counting tabs as 4 spaces). This is a “soft” rule, but long lines generally indicate unreadable or disorganized code."

tabWidth should be removed, this is only used if using spaces for indentation.

[nylen]

When using tabs for indentation, tabWidth is still needed to count line length correctly.

[ntwb]

Makes sense I guess in a Prettier context 👍

Though if one user uses 2 spaces and another user uses 4 spaces to display tab widths in their IDE/Editor then Prettier may appear to wrap code at column 78 for the 2nd user and column 80 for the first user if tabWidth = 80, lol, oh well, that's Prettier doing its thing I guess 😝