docs: Remove monthly challenges section

[adiati98]

Linked Issue

Closes #1668

Description

This PRs remove the "Monthly Challenges" from "Adding content" section on README as we've sunset monthly challenges per January 2026.

Methodology

Code of Conduct

By submitting this pull request, you agree to follow our Code of Conduct

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[greptile-apps]

Confidence Score: 4/5

[Low risk] Removes documentation about monthly challenges.

This documentation change is safe to merge, with a non-blocking broken link in the scheduled issue workflow.

Findings

1.  Scheduled issues lose their instructions ▶

Fix with agent prompt

### Issue 1
README.md:219
The monthly workflow in `.github/workflows/monthly-challenge-issue.yml:26` still links to the deleted `#monthly-challenges` section, so its generated issues send contributors to instructions that no longer exist. Retire the workflow along with the challenges, or update its link.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

Summary

Removes the monthly challenge contribution instructions from README.md after the challenges ended.

• The scheduled issue workflow still links to the removed section.
• adiati98 states that removing the instructions is intentional because monthly challenges ended in January 2026.

_{Reviews (1) · Last reviewed commit: "docs(README.md): remove monthly challeng..." · Reviewed by Greptile}

[greptile-apps]

Scheduled issues lose their instructions

The monthly workflow in .github/workflows/monthly-challenge-issue.yml:26 still links to the deleted #monthly-challenges section, so its generated issues send contributors to instructions that no longer exist. Retire the workflow along with the challenges, or update its link.

Prompt To Fix With AI

This is a comment left during a code review.
Path: README.md
Line: 219

Comment:
**Scheduled issues lose their instructions**

The monthly workflow in `.github/workflows/monthly-challenge-issue.yml:26` still links to the deleted `#monthly-challenges` section, so its generated issues send contributors to instructions that no longer exist. Retire the workflow along with the challenges, or update its link.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.