[docs] Updated commands installing Qt to current syntax
- 'install' command is depreciated and will be removed in the future. It was replaced by 'install-qt'.
- Flag '--archives' instead of '-m' has to be used to install packages.
- Packages were renamed from 'xmlpatterns' and 'x11extras' to 'qtxmlpatterns' and 'qtx11extras' respectively.
- Main installation and package installation had to be split into separate commands. Appending '--archives qtxmlpatterns qtx11extras' to the first line will install only packages and file Qt5Config.cmake required to compile DataExplorer will not be available.
New commands were tested on Linux.
@bilke Those commands work on my system (Fedora 36) and allow me to successfully compile DataExplorer, but I am not familiar with Qt5 framework. Please, check if I am not missing something, that should be taken into consideration.