Compatibility fixes for afchExtra

Apparently table-cells aren’t *supposed* to have display: relative
applied to them…and Firefox, unlike other browsers, sticks to this
standard.
Submission cleanup: comment removal, external link to wikilink correction, reference fixes

@Technical-13, please let me know if you spot any comments that I’ve
missed which should also be removed.

*uses some regexes originally by @wikipedia-mabdul in WPAFC/afch repo