doc(pkg): Explain package management (#10950) #28619

Job	Run time
Nix (macos-latest)	2m 8s
Build (macos-latest, 5.1.x)	16m 55s
Nix (ubuntu-latest)	52s
Build (ubuntu-latest, 5.1.x)	8m 55s
Coq 8.16.1	7m 17s
Build (ocaml-variants.5.3.0+trunk, ubuntu-latest, true)	4m 51s
Build (4.14.x, ubuntu-latest, true)	1m 43s
Coverage (5.1.x)	9m 29s
Build (4.14.x, macos-latest, true)	2m 20s
Documentation	51s
Build (5.1.x, macos-13, true)	6m 11s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	16m 25s
Format	59s
Build monorepo benchmark docker image	1m 51s
Build (ocaml-base-compiler.5.1.1,system-mingw, windows-latest)	10m 14s
Build (4.08.x, ubuntu-latest, true)	1m 32s
Build (4.04.x, ubuntu-latest, true, true)	4m 40s
Build microbenchmarks	2m 14s
Build (4.02.x, ubuntu-latest, true)	4m 5s
Create local opam switch (macos-latest, 5)	6m 19s
Create local opam switch (macos-latest, 4.14)	6m 19s
Create local opam switch (ubuntu-latest, 5)	5m 6s
Create local opam switch (ubuntu-latest, 4.14)	5m 6s
	2h 6m 22s

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