Create new website

[sverhoeven]

At the moment http://xenon-middleware.github.io/xenon/ is the Xenon landing page.

This should be changed to http://xenon-middleware.github.io/

The website should get a face lift and include info now found at

• https://github.com/xenon-middleware/xenon/blob/master/README.md
• https://xenonrse2017.readthedocs.io/en/latest/

[sverhoeven]

Simple landing page now available at http://xenon-middleware.github.io/