CICD

Fix HTML directory navigation by unifying file and directory handling #2528

Job	Run time
Test library (macos-latest, stable)	1m 14s
Test library (macos-latest, nightly)	47s
Test library (ubuntu-latest, stable)	1m 13s
Test library (windows-latest, stable)	6m 26s
Test library (windows-latest, nightly)	2m 5s
Test coverage (gcc-11, clang-12)	2m 19s
Lint	2m 2s
Test library (ubuntu-latest, nightly)	53s
Test coverage (gcc-10, clang-11)	3m 19s
Test coverage (gcc-11, clang-13)	2m 8s
	22m 26s

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