In the case of misuse or misunderstanding from a developer whereby,
if `sel` can receive user-controlled data, jQuery `$(sel)` can lead to the
creation of a new element. Current usage is using hard-coded selectors
in the templates, but nobody prevents that from expanding to
user-controlled somehow.
* Add fallback href link
* Switch async archive generation to use href links
* Edit all templates to use href instead of data-url for archives
* Add consistent rel="nofollow" as per wxiaoguang
