This is an alternative to D22728. It makes the {nav System Information} KCM appear in
System Settings' {nav System Administration} section.
Advantages over D22728:
- The information is more discoverable
- It automatically disappears if KInfoCenter is not installed or removed
- It requires no changes to SystemSettings' fragile codebase
Disadvantages:
- Since it doesn't open KInfoCenter or have a link to it, all the other information in KInfoCenter is not exposed
- If we do later want to adjust this KCM to have a button to open KInfoCenter when pushed, we'll hit https://bugs.kde.org/show_bug.cgi?id=410169 since the KCM will be already open in System Settings