The Simple Hugo theme is a bit too minimalistic (which was helpful during
conversion from a wiki, but less desirable as we look to go public with
the hugo site. Switch back to the Beautiful Hugo theme and tweak both the
theme and the config to get the site a little closer to Apertis branding.

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

We re not using the Lanyon theme, so remove it from the repo.

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

Add latest scripted conversion of wiki pages and move to simple
Hugo theme.

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