Fix insecure HTTP links in documentation

[arijitroy003]

Summary

Update insecure HTTP links to HTTPS in README.md, chart/README.md, and COMMITTERS.rst.

Changes

• README.md: Update airflow.apache.org provider docs link to HTTPS
• chart/README.md: Update kubernetes.io link to HTTPS
• COMMITTERS.rst: Update community.apache.org link to HTTPS

Testing

N/A — documentation link updates only. Verified all target URLs resolve over HTTPS.

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Was generative AI tooling used to co-author this PR?

• Yes — Claude Code

Generated-by: Claude Code following the guidelines

[boring-cyborg]

Congratulations on your first Pull Request and welcome to the Apache Airflow community! If you have any issues or are unsure about any anything please check our Contributors' Guide
Here are some useful points:

• Pay attention to the quality of your code (ruff, mypy and type annotations). Our prek-hooks will help you with that.
• In case of a new feature add useful documentation (in docstrings or in docs/ directory). Adding a new operator? Check this short guide Consider adding an example Dag that shows how users should use it.
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• Be patient and persistent. It might take some time to get a review or get the final approval from Committers.
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  In case of doubts contact the developers at:
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[shahar1]

Good catch, welcome to Apache Airflow!
Looking forward for more PRs.
Please note that for PRs that involve usage of LLM in the code changes, it must be declared in the PR body.
I'll let it pass because it's a trivial change - but please note for the next time.

[shahar1]

Staic checks currently fail, could you please fix?