Extended introduction content a bit.
Merge branch 'master' of https://github.com/ChristopheSteininger/Topics
Added sections on supervised and unsupervised learning.
Fixed some errors and formatting on the perceptron page.
Changed images to add transparency.
Merge branch 'website'
Removed some unnessecary CSS.
Added homepage (replaces index.html, which has moved to introduction.html) and linked header image to it.
Removed junk file.
Updated homepage text.
Removed more unneccesary CSS.
Made navigation links larger.
Added back a line of CSS that was causing bullets to appear in firefox.
Fixed merge conflict.
Fixed missing bracket messing up CSS.
Added some extra headings for the perceptron page.
Added subheading on introduction.
Merge branch 'applet'
Merge branch 'master' into website
Improve delta values calculation explaination and add applet page.