Add social-media buttons. Mod install script.

Add:
	static/css/_mixins.sass
		-add animation styling, which allows protracted animations (ie on-hover
		style change over the span of 300 milliseconds). Styled classes are
		called t3, t6, t9, t12, for 300ms, 600ms, and so on.

	static/css/_social_media.sass
		-styling for social-media button sidebar, with pure CSS animation.

	static/js/socialmedia.js
		-add on-click window-opening for social-media button-click.

	templates/layout.html
		-add social-media icon bar.

	static/images/socMedIcos/
		-dir for social-media icons.

Mod:
	install.sh
		-incorrect line for installing python-pip