Add anchors to sections to be able to link them directly

Hi,

It's somewhat a pity that a particular section of the dependency report could not be linked directly.
For example, if I'm interested in the dependency tree part of the report, each time I (re)load the page, I'll have to scroll down to find what I'm looking for.

(I seem to understand that this takes place in the maven-reporting-impl/AbstractMavenRenderer.startSection() method.)

Cheers.