Added dropbox link to readme

Signed-off-by: Tanya Gray <tanyagray.nz@gmail.com>
Merge branch 'gh-pages' of github.com:YouthTek/Portal
Updated site auto-run file for Windows
Added my slide for the slideshow
Updated slide to be correct dimensions
Merge pull request #7 from YouthTek/master

Updates to web server and slideshow
Spaceman from Te tuks youth space