Add pre-commit hooks for checking that docs are building correctly

[nud3l]

Is your feature request related to a problem? Please describe.
Vercel queues the docusaurus builds but can be a bit slow. Usually, docusaurus fails on broken links and then one needs to either inspect the vercel logs or build manually to see which links caused the build to fail.

Describe the solution you'd like
Add a git pre-commit hook to run yarn build in the docs folder but only if there are changes in the documentation. We could use husky for this.

Describe alternatives you've considered
An alternative is to not fail builds on broken links but that is not desirable since broken links should not be part of the documentation.