feat(helm): add Artifact Hub distribution and multi-arch builds

[Sanjaykumar-2005]

Changes:

• Helm Distribution: Added helm-release.yml workflow to publish charts to gh-pages on tag push.
• Artifact Hub: Added artifacthub-repo.yml and required annotations to Chart.yaml.
• Multi-Arch Support: Updated ci.yml to build Docker images for amd64 and arm64 via QEMU.
• Documentation: Added a dedicated Helm chart README and updated the main README with helm repo add instructions.

Verification:

• helm lint passed via Docker.
• Local Docker build initiated successfully.

Fixes #36

[github-actions]

🚀 First PR — welcome aboard!

A few things to expect:

1. CI: every PR runs build + race tests + lint + (eventually) the kernel matrix. If something fails, the log will tell you exactly which gate.
2. DCO: every commit needs Signed-off-by: — git commit -s adds it automatically.
3. Conventional Commits: PR titles like feat(doctor): add new rule or fix(bpf): handle X. We squash-merge by default.
4. Review: a maintainer will review within 72 hours. Suggestions are conversations, not orders — push back if something doesn't fit your context.

If you get stuck, reply here or jump to Discussions. We want this PR to land.