Removed link-ish look of the .geometry bullet point.

Now that its clickability is documented enough by a changing cursor, I made it
look like normal text. The good thing is that I now have the whole <td> space
to click on, instead of the tiny tiny link before.
This improves the ghastly bit about time information.

Wow I cannot believe I am able to produce something this horrible.
Disabled pointy cursor on .geometry table header cell.

It might confuse a lot of people that nothing happens when they click on it.
You can now switch the document time on and off.

I realize that using the class attribute as an internal state is not my best
idea so far; this makes it way harder for anyone else to understand my style
sheet hierarchy.
This does not solve it but looks more systematic.