Modifications to index.html

Changes:
* Changed 4 spaces for indents to tabs (4 spaces width)
* Moved Modernizr.js to bottom of page because it should be with the rest to follow style
* Cleaned up CSS a little, couple of loose breaks there
* Moved H5BP css classes above the custom css because we want to allow people to override them if they wish (may need reviewing)
* Changed main section to main element to fit with HTML5
* Changed {HasPages} to be inside the nav list; ask, submit and archive should show there even if there is no pages
* Standardized figcaptions cause they were annoying me lol

Additions:
* Added {SubmissionsEnabled} & label to nav
* added HTML5shiv and js fixer for less than IE9 browsers

Deletions:
* Removed a CSS comment titled Primary Styles
* Removed note count block within text post, isn't it in the posts footer?