docs: update readme and contributing for biome

[Morosan]

Description

Updates the project documentation to reflect the current linting and formatting workflow based on Biome.

Documentation

Updated README.md and CONTRIBUTING.md with:

• Biome as the linting and code formatting tool
• The nx affected -t check command for affected publishable projects
• The nx run beeq:check command for checking the core package
• The --write option for autofixing supported issues

Checklist

• I have read the CONTRIBUTING document.
• I have read the CODE OF CONDUCT document.
• I have reviewed my code.
• I have tested the changes locally.
• I have updated the documentation (if applicable).
• I have added unit tests and e2e tests (if applicable).
• I have requested reviews from relevant team members.

[dgonzalezr]

Suggested change

	**Follow the style you see used in the repository!** Consistency with the rest of the project always trumps other considerations. BEEQ uses [Biome](https://biomejs.dev/) for linting and code formatting, so please make sure it is configured in your IDE/editor.
	**Try to follow the existing style in the repository as closely as possible.** Keeping things consistent with the rest of the project is more important than following generic preferences.
	BEEQ uses [Biome](https://biomejs.dev/) for linting and formatting, so it’s worth setting that up in your IDE or code editor before you start.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[dgonzalezr]

You can change the target branch to 'main'. I think it's useful to have that info available asap.

[Morosan]

You can change the target branch to 'main'. I think it's useful to have that info available asap.

Created a new PR here #1648 with a clean branch from main since this was created from chore/migrate-to-stencil-vitest