The tag archive header shares the same classes as post cards, but have different elements.
This changes the selector to target article.post-card, which ignores header.post-card
closes#634, closes#635
- use `document.importNode` to create a clone of post card elements when pulling them in from infinite scroll pages
- cloning the element means the element's owner document matches the viewed document and ensures images in the inserted post card elements are sized according to the viewed document
no issue
- replaces author hover JS that was lost during merge
- replaces `floating-header.js` with `sticky-nav-title.js` containing the relevant JS that was lost during merge with a cleanup for unused variables and unnecessary event listeners
- removes reference to non-existent `{{> floating-header}}` partial
