Improve first experience by displaying hints on the first page

[jokkedk]

On the installation page, I see a lot of complaining about getting webgrind to work.

It actually isnt that hard, but webgrind should be able to answer all setup problems on the first page. Ie. display some installation hints there, depending on the current settings for profile directory etc.

[davidb2002]

I would also suggest adding a 'help' page which explains what all the different numbers mean. There isn't anything that says.