Search weighting

[harrislapiroff]

I think we can improve the weighting of search results. For example in this search, I think the third result should be the first:

I think we can get some wins here by weighting the following items more highly:

• Documentation: title should be more highly weighted than content
• Discourse: title should be more highly weighted than content. content of initial post should be more highly weighted than responses.
• Wagtail: title should be more highly weighted than content.