Fix 404 broken links in documentation for benchmark setup pages

[Copilot]

Several documentation pages referenced non-existent markdown files (writing-a-benchmark.yaml-file.md, running-haddock-runner.md, writing-a-input.list-file.md), causing 404s across the manual.

Changes

• home.md: Redirect /writing-a-benchmark.yaml-file → /usage#step-3-write-the-benchmark-configuration
• installation.md: Fix three broken Next Steps links to point to the relevant usage.md anchor sections
• usage.md: Replace self-referential broken links with in-page anchors (#step-3-..., #step-4-...)
• examples.md: Update all three broken "Additional Resources" links to ./usage.md#<anchor> equivalents

All broken references now resolve to existing anchor sections within usage.md, which already contains the referenced content.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Coverage ∅ diff coverage · +0.00% coverage variation

Metric	Results
Coverage variation	✅ +0.00% coverage variation
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (bf26dce)	577	231	40.03%
Head commit (5ff7f0a)	577 (+0)	231 (+0)	40.03% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#180)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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