Revise README with updated BigSet features and instructions

[gargi-boop]

Updated the README to reflect the new features and clarifications about BigSet's functionality and setup process.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR updates the BigSet project README.md with a comprehensive restructuring of the landing page and onboarding documentation. The hero tagline was revised to emphasize the multi-agent system positioning. The main body was rewritten to add an experimental warning, a "How It Works" section, a "Things to Know Before You Start" checklist, clarified step-by-step setup instructions for Clerk, OpenRouter, and TinyFish, updated Convex admin key generation guidance, a new environment variable reference table, and streamlined dataset loading instructions. A new Roadmap section was added to outline upcoming features.

Suggested reviewers

• simantak-dabhade

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and specifically summarizes the main change: updating the README with revised features and instructions for BigSet.
Description check	✅ Passed	The description is relevant to the changeset, explaining that the README was updated to reflect new features and clarifications about BigSet.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

🧹 Nitpick comments (1)

README.md (1)

136-138: 💤 Low value

Add language identifier to fenced code block.

For consistency with other code blocks in the README and better syntax highlighting, consider adding a language identifier (e.g., bash or shell).

📝 Suggested improvement

-```
+```bash
 CONVEX_SELF_HOSTED_ADMIN_KEY=convex-self-hosted|0113.....

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In @README.md around lines 136 - 138, Add a language identifier (e.g., bash or
sh) to the fenced code block that contains the environment variable example
CONVEX_SELF_HOSTED_ADMIN_KEY so the README's code block matches other examples
and enables syntax highlighting; locate the fenced triple-backtick block
containing CONVEX_SELF_HOSTED_ADMIN_KEY and change the opening fence to include
the language (for example replace withbash).

</details>

</blockquote></details>

</blockquote></details>

<details>
<summary>🤖 Prompt for all review comments with AI agents</summary>

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In @README.md:

• Around line 136-138: Add a language identifier (e.g., bash or sh) to the
  fenced code block that contains the environment variable example
  CONVEX_SELF_HOSTED_ADMIN_KEY so the README's code block matches other examples
  and enables syntax highlighting; locate the fenced triple-backtick block
  containing CONVEX_SELF_HOSTED_ADMIN_KEY and change the opening fence to include
  the language (for example replace withbash).

</details>

---

<details>
<summary>ℹ️ Review info</summary>

<details>
<summary>⚙️ Run configuration</summary>

**Configuration used**: Organization UI

**Review profile**: CHILL

**Plan**: Pro

**Run ID**: `ac950451-07e4-451b-ba5e-43b0813889c8`

</details>

<details>
<summary>📥 Commits</summary>

Reviewing files that changed from the base of the PR and between b097e38129c972521eefb5721c85133dd79a863b and c1635136012f59b33ad6baa21a992a1e2c2e8e46.

</details>

<details>
<summary>📒 Files selected for processing (1)</summary>

* `README.md`

</details>

</details>

<!-- This is an auto-generated comment by CodeRabbit for review status -->