Clean up document titles

Many of the document titles contain directory names and/or are missing
spacing between words. This has a number of effects:

- It gives users a bad impression of the quality of the information on the
  website
- It makes it harder for external search engines to catalog the contents
  of the website in a meaningful way
- Reduces the effectiveness of any local searching that we implement

Do an initial quick pass on the titles to make them more legible.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>