MathJax-web-presence.md

-We want to keep MathJax present on the net in various ways.
+We want to keep MathJax present on the net in various ways. This page lists all these and documents their usage where necessary.
 
 * [MathJax.org](http://www.mathjax.org) our main website
      * The wiki page [[Mathjax.org]] collects guidelines for the content at mathjax.org.