Adding a custom search widget which modifies query before sending.

Fixes #30.
Moving search box to be defined after correct SITEURL set.
Adding draft for Wheels speedup post.
Keeps LaTeX images original size to allow overflow.
Re-writing math in some-fibonacci-fun-with-primes to avoid overflow.

Also removing old image and forcing the JSON cache files to have
easy to diff output via indents and sort_keys.
Making pass through all latex-img's to eliminate overflow on Desktop.

Also adding script to remove an old latex-img quickly.