Websites are not suited to displaying equations. They can be added as images taken from some other package (Word for example); but rendering an equation like this:
`f(a) = 1/(2pii) oint f(z)/(z-a)dz`
Isn’t that easy.
This whole section is dedicated to explaining how to load and use MathJax. It also gives a fairly comprehensive explanation of AsciiMath as a shortcut method of writing equations.