docs(website): Getting Started and Formatter improvements

[Conaclos]

Summary

This PR provides some minor improvements to the website docs:

• Getting Started
  • Remove some redundancies: we claim several times that Biome is opinionated.
  • Remove the jsonc code sample.
    It doesn't add so much value.
  • format --write <files> is more natural to users and simplify its modification when copied on the CLI
  • Add a link to our dedicated CI action
• Formatter
  • Merge general and language-specific options in a single code sample.
    Users reading this section for the first time might stop at the general options and wonder if Biome supports formatting options such as arrowParentheses.
    It seems better to put all the options in the same place.
    This also makes it easier to copy and paste the config.

Test Plan

Ci should pass.

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[arendjr]

👍

[togami2864]

LGTM

[SuperchupuDev]

other than this LGTM

[ematipico]

Reminder to copy this new content to biomejs/website repository :)