Add a new layout for documentation with a top level menu and start using it

This is a start of a fix for #70
First pass generation of component documentation

Lots of buggy bits, dead links and cruft.
At least this should encourage us to fix things!
Update documentation against 14.6.0
Replace all < and > with the appropriate HTML chracters

Manually with sed ATM. TODO: Make this happen during conversion.
Move component docs to subdirectory per release and update links
Merge pull request #106 from jrha/component_docs

Component documentation