docs: add beta tag and active development notice to README

[iamdin]

Summary

• Added orange beta status badge to README
• Added prominent notice about active development to inform users that features and APIs may change before stable release

Test plan

• Verified badge renders correctly on GitHub
• Confirmed notice is visible and clearly communicates project status

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation

  • Added a beta status badge to the README.
  • Introduced a new note block highlighting active development status.

• UI Changes

  • Newsletter signup on the landing page has been disabled/removed (newsletter section and controls are no longer active).

• Chores

  • Minor internal type annotation adjustment with no runtime behavior change.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3f6df4f

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Presentational update to README.md adding a beta badge and active-development note; UI-related imports and newsletter section in apps/www/src/components/landing/newsletter.astro are commented out; apps/www/src/pages/og/index.ts casts the PNG buffer to BodyInit when creating the Response — no runtime behavior changes.

Changes

Cohort / File(s)	Summary
Documentation update README.md	Added a beta status badge and an active development note block at the top; existing descriptive paragraph preserved.
Landing newsletter (UI disabled) apps/www/src/components/landing/newsletter.astro	Commented out Button and Input imports and surrounding newsletter markup; newsletter UI is effectively disabled/commented without control-flow changes.
OG image response typing apps/www/src/pages/og/index.ts	Cast PNG buffer to BodyInit when constructing the Response (pngBuffer as BodyInit); type-only change, no runtime behavior modification.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🐰
I nibbled lines and left a badge so bright,
A note that says “we’re working through the night,”
Inputs snoozing in the newsletter burrow,
A tiny type cast — swift and thorough.

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The pull request title "docs: add beta tag and active development notice to README" accurately and directly reflects the main changes in the changeset. The raw_summary confirms that the PR adds a beta status badge and active development notice to the README, with no functional code changes. The title is specific, concise, and uses clear terminology ("beta tag" and "active development notice") that conveys exactly what was modified. It follows conventional documentation change patterns with the "docs:" prefix and contains no vague or generic language.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between c52faa2 and 3f6df4f.

📒 Files selected for processing (2)

• apps/www/src/components/landing/newsletter.astro (1 hunks)
• apps/www/src/pages/og/index.ts (1 hunks)

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