experimental work on including a side bar. make the header html rather bitmap
added template files that can be reused on all pages
converted index.html to use jekyll and template files
removed typo
templified features.html and download.html
converted the rest of the pages to using jykell templating
added missing logo image
updated side bar links
prepare download pages for 3.0 release
prepared documentation pages for 3.0 release
added ref
updated refs
added ref
added ref
reorder preprint
updated tutorial page
remove progress bar image from features
remove progress bar image from features
Merge branch '3.0-restructure' of https://www.github.com/qutip/qutip.github.io into 3.0-restructure
update tutorials section: index notebooks