docs(links): replace redirected and stale URLs with current targets

[kranthipoturaju]

Summary

Replaces outdated and redirecting documentation links across markdown files with their current canonical URLs, and fixes a missing newline at the end of feature_request.md.

Changes

• README.md: Updated two links:
  • Encrypted secrets reference: help.github.com → docs.github.com/en/actions/how-tos/write-workflows/choose-what-workflows-do/use-secrets
  • REST API rate-limiting: rest/overview/resources-in-the-rest-api#rate-limiting → rest/using-the-rest-api/getting-started-with-the-rest-api?apiVersion=2026-03-10#rate-limiting
• docs/advanced-usage.md: GitHub-hosted runners link updated from using-github-hosted-runners/about-github-hosted-runners → concepts/runners/github-hosted-runners
• docs/adrs/0000-caching-dependencies.md: Node.js build-and-test guide updated from actions/guides/building-and-testing-nodejs → actions/tutorials/build-and-test-code/nodejs, anchor preserved
• .github/ISSUE_TEMPLATE/feature_request.md: Added missing newline at end of file

Motivation

Several documentation links had been moved as part of GitHub Docs site restructuring (help.github.com → docs.github.com, guides/ →
tutorials/, using-github-hosted-runners/ → concepts/runners/, REST API overview reorganisation). Leaving redirect chains in place
degrades link reliability and may break in the future if redirects are removed.

Impact

• Documentation readers and contributors will land on the correct, up-to-date pages without following redirect hops.
• No functional code changes; no action inputs, outputs, or runtime behaviour are affected.
• Fully backward-compatible.

Testing

All updated URLs were validated with curl -sIL to confirm HTTP 200 responses at the final destination before committing. No automated tests are required for documentation-only changes.

Related issue:
No issue is created as the change is related to documentation improvement only.

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

Updates documentation links across the repository to point to current GitHub Docs canonical pages (avoiding redirects/stale paths) and includes a minor formatting fix in an issue template file.

Changes:

• Updated redirected/stale GitHub Docs URLs in README.md, docs/advanced-usage.md, and docs/adrs/0000-caching-dependencies.md.
• Kept existing anchors intact while moving to newer docs paths (e.g., caching example anchor in ADR).
• Adjusted .github/ISSUE_TEMPLATE/feature_request.md formatting (missing trailing newline per PR description).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
README.md	Replaces outdated GitHub Docs links for encrypted secrets and REST API rate limiting.
docs/advanced-usage.md	Updates GitHub-hosted runners link to the newer “concepts/runners” docs location.
docs/adrs/0000-caching-dependencies.md	Updates Node.js build-and-test docs link to the newer tutorials path while preserving the anchor.
.github/ISSUE_TEMPLATE/feature_request.md	Adds a missing newline at EOF (formatting-only change).

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