[Feature] Custom PR template for this repo

**Is your feature request related to a problem? Please describe.**
We should be reminded to link-check locally as a consequence of #194.

**Describe the solution you'd like**
A custom PR template for this repo.
We could also remove the question "Does this update require a change to the documentation" and anything else that does not fit well with this repo in the process.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.

Start by reading issue #194 for the link-check context and compare the requested questions with what fits this repository. Add a repo-specific pull request template that reminds contributors to link-check locally and removes unsuitable prompts; done means the template reflects this workflow.

Written by the indexing model from the issue text.