Insert and delete page image refs on page insert and delete

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Allow GetStartpage to fail if the entire site is empty

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Add support for Accordions

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Add support for plugin content categories

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>