Improvement of pre-commit hook settings for pylint

[lan496]

Improvement of settings for pylint in .pre-commit-config.yaml, continuation of #2492 (@janosh, thank you for telling me the snippet!)

• I have confirmed pylint is now automatically installed when pre-commit hooks are called.
• Adding instructions to set up optional dependencies in docs.

[coveralls]

Coverage decreased (-0.7%) to 83.272% when pulling 0aacddd on lan496:pylint-hook into 827ad4e on materialsproject:master.

[janosh]

Oops, looks like pylint is too slow for pre-commit.ci (timeout after 180 seconds). I guess it needs to be skipped after all.

[lan496]

I have restored to skip pylint in pre-commit.ci due to the timeout limitation.
I believe it is ready to be merged after all other tests are passed!