[#164] Resolve "General FAQ for Splash site"

Closes #164 (closed) This adds a simple anchors list FAQ to the Signalboost.info site. Please do review for typos and accuracy. I left out a few additional items I'd outlined in the original doc https://our.solidarity.camp/apps/onlyoffice/3344 because the describe commands and features still under development. I also left out a bunch of links to additional resources as those resources don't yet exit. (note: additional css and hacky span is to make the fixed site header not cover the title of the FAQ topic when you jump to each topic.)