menu-button, css

Added menu-button and related CSS for smaller resolutions. Fixed iOS and
Mozilla rendering of form elements (border-radius, styling). Removed
image loading background (interfered with transparent images).
Consolidated margin rules.
Smart Quote formatting

Added function to automatically "unformat" code within <code> and <pre>
blocks.

Removed unnecessary tiny.js and reCAPTCHA code.
Fixed vertical centering

There was an error with vertically centring images taller than the
viewport. Removed vertical centring.
Loading image

Added image and centred content on loading page
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