Migrate app components to URLs that match their names
Currently, there are several components whose documentation URLs do not match their exact names. These components are:
- xfce4-notifyd
- xfce4-screenshooter
- xfce4-terminal
The following steps are needed to bring the documentation in line with the rest of the components
- Create new locations on docs.x.o to match their proper names.
- Update links on existing/old sub-pages to point to new locations.
- Remove outdated sub-pages
- Update links on 4.16 sub-tree in docs.x.o
- Migrate images to new location
- Update READMEs
- Update code pointing to help files in apps