Doc navigation improvement for V1

[yuxizama]

• Regrouped “Fundamental” and “Guide” sections to streamline navigation and reduce redundancy.
• Updated the welcome page to reflect the regrouping.
  Gitbook preview: https://app.gitbook.com/o/-MIF05xPVoj0l_wnOGB7/s/8raIwx2DJQ6v1vFpIMJQ/~/audits

[github-actions]

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[IceTDrinker]

Thanks I'll take a look to fix our automated CI checks