Templates don't know at what level they will be inserted. Previously, we
hard-coded the title style which is not compatible with the build target
system. Define a set of styles which will be replaced by the gendoc script
when it encounters them:
'<' : Make this title a sub-heading
'/' : Make this title a heading at the same level
'>' : Make this title a super-heading
The build target system is now basically complete and functioning.
Hook up templating system to read the CHANGELOG for version and changelog info.
Modified nature.css to make it clearer on table headings/sub-headings. Use the
full _matrix/client path on title links to make it clear it is for v1.
Use 'x-example' to add examples to parameters which are not in 'body' (swagger
doesn't define that currently). Add profile API examples. Add necessary glue
and templates to make it all work.