[DOC] - Swap order of yarn install/pre-commit install

Preliminary Checks

• This issue is not a question, feature request, RFC, or anything other than a bug report. Please post those things in GitHub Discussions: https://github.com/nebari-dev/nebari/discussions

Summary

The documentation contributing docs tell users to
yarn install
THEN
pre-commit install

However, if you do it in that order, you'll get an error. This is because yarn install installs the husky precommit hook. Then when you run pre-commit install you get the error:

[ERROR] Cowardly refusing to install hooks with `core.hooksPath` set.
hint: `git config --unset-all core.hooksPath`

if you follow those directions... the husky pre-commit will no longer work and you'll end up not catching linting/formatting issues until opening a PR.

Steps to Resolve this Issue

It would be nice if we didn't need two different avenues for pre-commits - not sure the history on this. At the very least, if we just tell users to install pre-commit first, then run yarn install, it should fix this.

Open the “Install documentation dependencies” section linked in the issue and review the current yarn and pre-commit instructions. Update the documented order so the setup avoids the core.hooksPath error and preserves both hooks. Verify the rendered contributing documentation shows the corrected sequence.