Modify model directory documentation UI and related pages #5566

Job	Run time
clang-format	18s
cppcheck	6m 53s
rstcheck	24s
vale	33s
copyright_headers	15s
forbidden_types	14s
lychee_IGNORED	22s
unused_names	37s
isort	12s
mypy	35s
pydocstyle	21s
pylint	36s
black	30s
flake8	24s
sphinx-rtd	3m 15s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	15m 13s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	14m 14s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	19m 27s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	19m 21s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	31m 34s
	1h 55m 18s

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