docs: update CONTRIBUTING, SUPPORT, and README

[kavyamsft]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

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Summary

Standardizes guidelines across MS Learn and other Azure Linux repos.

Change Log

• SUPPORT.md: added instructions for official production support
• CONTRIBUTING.md: link to the Azure Linux contribution philosophy and best practices available on MS Learn
• README.md: credit Larry Ewing for the Tux-inspired penguin icon

Does this affect the toolchain?

NO

Associated issues

Links to CVEs

Test Methodology

N/A

[Copilot]

Pull request overview

Updates repository documentation to align with standardized guidance across Azure Linux-related repos and Microsoft Learn, clarifying support channels and attribution.

Changes:

• Adds a “Production support” section to SUPPORT.md clarifying when to use Azure Support vs GitHub issues.
• Links CONTRIBUTING.md to the Azure Linux contribution philosophy/best-practices guidance on Microsoft Learn.
• Adds attribution for the Azure Linux penguin icon inspiration in README.md.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
SUPPORT.md	Clarifies production support vs GitHub issue intake; adds issue-reporting guidance link.
CONTRIBUTING.md	Adds an upfront link to contribution philosophy/best practices guidance.
README.md	Adds icon inspiration attribution in acknowledgments section.