Update readme

[Virtute90]

PR Checklist

• My branch is up-to-date with the Upstream main branch.
• The unit tests pass locally with my changes (if applicable).
• I have added tests that prove my fix is effective or that my feature works (if applicable).
• I have added necessary documentation (if appropriate).

Short description of what this resolves:

Changes proposed in this Pull Request:

Updated readme with some new information:

• Removed links to vercel.app
• Fixed table of contents
• Suggested new method for new react app
• Added links for documentation
• Added web template link for react project
• Correct indications for contribution to the codex
• Fixed file tree for new component

[vercel]

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Name	Status	Preview	Updated (UTC)
design-react-kit	✅ Ready (Inspect)	Visit Preview	Apr 10, 2024 5:38pm

[astagi]

Grazie @Virtute90 🙏