Pre-commit hooks need more documentation

[garloff]

As mentioned in #287 (comment) (point 4), commits are not working without further work.
(a) https://docs.scs.community/community/contribute/linting-guide/ says that husky, prettier and markdownlint-cli2 are being used. Following the links and following the install instructions means installing npm install --save-dev husky (which is harmless), npm install --save-dev --save-exact prettier (which pulls in a few dozen dependencies and may not be as harmless) and npm install --save-dev markdownlint-cli2 (not exatcly harmless either) . Explicitly mentioning that those two npm packages need to be installed (maybe best into a container) would be good.
(b) It still does not work as is, as the docs repo has this

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

in .husky/pre-commit
This file does not exist in git. I created an empty one to make commits work, but this is likely not how it's supposed to be done ...

[garloff]

Ah nice, the pre-commit file hides its last line due to a missing linebreak

#!/bin/sh
. "$(dirname "$0")/_/husky.sh"

npx lint-staged

[garloff]

Oh, and while I can find and install markdownlint-cli2, this is not the case for markdownlint-cli2-fix, which the node index nor even google seems to know ...