Remove README.md API section, refactor Documentation section

[flevi29]

Pull Request

What does this PR do?

• removes README.md API section
• refactors Documentation section

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.84%. Comparing base (1064d09) to head (0b9e5ca).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1866   +/-   ##
=======================================
  Coverage   98.84%   98.84%           
=======================================
  Files          17       17           
  Lines        1565     1565           
  Branches      338      338           
=======================================
  Hits         1547     1547           
  Misses         18       18           

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