Create a webpage for impress.js

I think you should create a webpage to advertise the project. Demos are useful to showcase the software's capabilities but are not a good way to communicate new releases, share tutorials or templates.

I'm really happy that relative positioning, substeps and markdown support were added. I think these features greatly improve the software's usability and in IMHO creating a webpage would be a good way to create momentum for the project.

Thanks a lot for your work. I'm really happy the project is moving forward after such a prolonged hiatus and I look forward to testing all this new stuff.