Kubuntu Manual 22.04.2 LTS

This release is an update for the 22.04 branch for Kubuntu 22.04.2 LTS and does the following:

• update to 22.04.2 release
• reorder welcome chapter
• update copyright and version
• add configuration files section

Fixes the following bugs:

• #9
• #12
• #13
• #16

Thanks to @nerdfever for reporting them!