Add new index page with user-modifiable example.

I'm keeping report.html around as a stripped-down example of how most users
would go about creating a portfolio page.  'Cause, like, they only want to show
off their own information, not anyone else's.  Also, the index should at some
point in time have a bunch of explanatory text on it.
Empty #portfolinator before filling.

If running a multi-submit page, like the new index page, we want to overwrite
the previous contents of the div, not keep appending to them.  And users
shouldn't put anything important in there, or it's their own damn fault if we
erase it.