Clicking on links in Chapter 15 draft doesn't work

[pavpanchekha]

Clicking on links was broken by the dispatch change. The core reason is thus:

• When you click on something, we resolve it to a /layout/ object
• You then walk up and dispatch based on the /element/ tree
• This is important because an <a> tag does not have a layout object in our browser

My best suggestion is that we undo the dispatch changes, which is also shorter.