fix: Bring FAQ entries in line with live site, both copy and links

#95 (closed) and #96 (closed) point out that the current, live state of the FAQ page is not entirely reflected by the in-progress faq.html.jinja. Several entries were missing, and several others were missing important links.

This commit addresses this oversight by:

• Adding the missing FAQ entries from #95 (closed), including their links
• Adding the missing links noted in #96 (closed)

It is important to note that one of these links points to the currently-nonexistent state disclosures page mentioned in #97 (closed). Additionally, there is another page linked to which is currently hosted by the live donate site - /refund-policy/ - but not currently part of the donate-neo codebase. (I will note this in #97 (closed) shortly.)

Closes #95 (closed), #96 (closed).