Revert "Funky slidering text decoration on hover."

This reverts commit d52f7f9edbe6084cbe563dc5a8fc1c714d57e1de.
Tweak with link styling.  Medium inspired.
Not so many pages.
Style pagination links and post date.
Add more padding to code in posts. Hopefully make it easier to scroll when necessary.
Tweak headings on larger devices and centralise text.
Add shading to header to make it more readable.
Add arrows to pagination.
Remove unused images.
Add social buttons to footer and sprite images.