docs: getting started

[ematipico]

Summary

I took the opportunity to change things around contribution guidelines and the tools we use in the repository:

• we now format .toml files, which is very convenient. It's not set in the CI and we keep it that way for now
• added more scripts inside justfile, which should make our development process smoother. For example, I like the command just test-crate rome_cli, which we can run from anywhere, regardless of where we are.
• all scripts in justfile are now documented, and some of them have aliases
• we should use nextest, which should be faster at running tests
• I made the contribution guidelines smaller and more straight forward: setup -> install tools -> test -> commit. I believe it could work

Test Plan

N/A

Changelog

N/A

• The PR requires a changelog line

Documentation

• The PR requires documentation
• I will create a new PR to update the documentation

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[github-actions]

Parser conformance results on ubuntu-latest

js/262

Test result	main count	This PR count	Difference
Total	48863	48863	0
Passed	47810	47810	0
Failed	1053	1053	0
Panics	0	0	0
Coverage	97.84%	97.84%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6212	6212	0
Passed	1763	1763	0
Failed	4449	4449	0
Panics	0	0	0
Coverage	28.38%	28.38%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	639	639	0
Passed	573	573	0
Failed	66	66	0
Panics	0	0	0
Coverage	89.67%	89.67%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	17224	17224	0
Passed	13121	13121	0
Failed	4103	4103	0
Panics	0	0	0
Coverage	76.18%	76.18%	0.00%