chore: HoTT.Tests -> HoTT_Tests, HoTT.Contrib -> HoTT_Contrib #3953

Job	Run time
quick-build (dev, ubuntu-latest)	3m 19s
quick-build (9.0, ubuntu-latest)	3m 12s
nix	2m 10s
build (9.0)	3m 18s
quick-build (9.1, ubuntu-latest)	3m 8s
opam-build (9.1, ubuntu-latest)	4m 20s
build (9.1)	3m 21s
opam-build (dev, ubuntu-latest)	4m 3s
build (dev, --warnings)	3m 50s
opam-build (9.0, ubuntu-latest)	4m 12s
doc-alectryon	11m 55s
doc-coqdoc	1m 43s
doc-timing	1m 37s
doc-dep-graphs	7m 31s
coqchk (9.1)	1m 57s
install (9.1)	1m 46s
install (9.0)	1m 41s
coqchk (dev)	1m 56s
coqchk (9.0)	1m 47s
install (dev)	1m 56s
delete-artifacts	10s
deploy-doc	0s
	1h 8m 52s

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