Link to specific FAQ from donation form (checks)

* Adds slug to FAQ model
* Uses this slug when generating anchor links on the FAQ page
* Updated fixtures to include latest FAQ content (and slugs)
* Non-JS users get all FAQs open by default
* If a url hash is present, it is checked when initializing the collapsibles. If there's a match, that collapsible stays open
* Link to the specific question from the donation form