docs(readme): add Trendshift trending badge

[spomichter]

Cherry-pick of #1563 (merged to dev) for main.

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• I have read and approved the CLA

[greptile-apps]

Greptile Summary

Adds a Trendshift trending badge to the README, placed between the existing shields.io badges and the navigation links. This is a cherry-pick of #1563 (merged to dev) for main. The change is purely cosmetic — a single HTML <a>/<img> element — with no functional impact.

Confidence Score: 5/5

• This PR is safe to merge — it only adds a badge image to the README with no code changes.
• The change is a single-line addition of a badge to the README. There is no code logic, no configuration change, and no risk of breakage. The HTML markup is well-formed and the URLs are consistent.
• No files require special attention.

Important Files Changed

Filename	Overview
README.md	Adds a Trendshift trending badge image with link, placed below the existing badge row. No issues found.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README.md Badge Section] --> B[Existing shields.io badges]
    A --> C["New: Trendshift trending badge"]
    C --> D["Links to trendshift.io/repositories/23169"]
    C --> E["Loads badge image from trendshift.io API"]

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_{Last reviewed commit: 13537b9}