Update CONTRIBUTING.md to simplify guidelines

[Alek99]

Notion is not up to date we should just use github issues

[greptile-apps]

Greptile Summary

This PR removes the link to the Notion contributing guide from CONTRIBUTING.md, as it is reportedly out of date. The change is minimal and non-breaking — only two lines (the link sentence and its trailing blank line) are deleted.

Confidence Score: 5/5

Safe to merge — documentation-only change with no functional impact.

The change removes a single stale external link from a markdown file. No code, no logic, no tests are affected. No custom rules apply to this change.

No files require special attention.

Important Files Changed

Filename	Overview
CONTRIBUTING.md	Removes the stale Notion contributing guide link and its trailing blank line; no other content changed.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Contributor reads CONTRIBUTING.md] --> B{Before PR}
    B --> C[Notion Guide link present\nbut stale/out-of-date]
    C --> D[Confusion / outdated info]

    A --> E{After PR}
    E --> F[Notion link removed]
    F --> G[Contributor proceeds to\nGitHub Issues for guidance]

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_{Reviews (1): Last reviewed commit: "Update CONTRIBUTING.md to simplify guide..." | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

✅ 9 untouched benchmarks

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_{Comparing Alek99-patch-1 (246dfd8) with main (1a64caa)}