Remove fingerprinting from MathJax config JS to shorten its generated
filename. Reduces chance of JS filenames becoming too long for user's OS
to handle due to long Sha512 asset fingerprinting.
Minifies and fingerprints Academic's own JS for faster loading and to
prevent old versions getting cached by web browser.
Refactors Algolia search JS into its own file.
Close#768
See #794
