docs: fix README tip link to cachekit-py + backend-agnostic framing (LAB-1430)

[27Bslash6]

Fix README Tip Link and Update Backend-Agnostic Framing

Summary

This PR corrects a documentation reference in the README that pointed to an incorrect repository and revises the wording to be backend-agnostic.

Changes

• Updated the tip link in README.md to point to the correct repository: cachekit-py (https://github.com/cachekit-io/cachekit-py) instead of the previous cachekit link.
• Revised the accompanying text from "Redis caching with Python decorators" to "decorator-based caching in Python", removing the Redis-specific reference to present a backend-agnostic description.

Purpose

These documentation updates ensure users are directed to the correct Python package repository and that the messaging accurately reflects the tool's decorator-based, backend-agnostic nature.

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[coderabbitai]

Walkthrough

The README Overview tip link now points to cachekit-py for decorator-based Python caching instead of cachekit for Redis caching.

Changes

README link update

Layer / File(s)	Summary
Update the Overview caching reference README.md	The Python caching reference now links to cachekit-py for decorator-based caching.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarises the README link correction and backend-agnostic wording change.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch lab-1430-readme-tip-link

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