Change to utf-8

The examples were using

    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">

Which is out-dated. Any browser that supports WebGL supports the newer way.
It's also not very socially aware as it's English only.

Changed to

    <meta charset="utf-8">

Which is the modern way as of like 6 years ago and is also internationally
friendly.