doc: Update helm chart ingress controller setup info

[vlasebian]

Summary

References issue #44 in lorawan-stack-k8s repo.

Screenshots

Changes

• Update step in prerequisites section of the k8s generic TTS hosting instructions.
• Update affected yaml configuration

Notes for Reviewers

• Is there more info need for the ingress controller step or is it enough?

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Run Locally: Verified that the docs build using make server, posted screenshots, verified external links. Test with HUGO_PARAMS_SEARCH_ENABLED=true if style changes will affect the search bar.
• New Features Marked: Documentation for new features is marked using the new-in-version shortcode, according to the guidelines in CONTRIBUTING.
• Style Guidelines: Documentation obeys style guidelines in CONTRIBUTING.
• Commits: Commit messages follow guidelines in CONTRIBUTING, there are no fixup commits left.

[KrishnaIyer]

This looks good. Can you add the Traefik and Nginx examples?
You can create an sample-ingress-controllers doc and add the examples of Traefik and Nginx there.

[vlasebian]

This looks good. Can you add the Traefik and Nginx examples? You can create an sample-ingress-controllers doc and add the examples of Traefik and Nginx there.

Done.

[KrishnaIyer]

This looks good. Let's get back here once https://github.com/TheThingsIndustries/lorawan-stack-k8s/pull/44 is reviewed and merged in case there are updates from there that need to be adapted here.