Include manual installation info for SLES and Ubuntu

[mfriesenegger]

          I will create an issue for a future effort to fix the manual installation section.

Originally posted by @mfriesenegger in https://github.com/openmainframeproject/feilong/pull/835#pullrequestreview-2227886461

The manual install section explains how to build for RH. The section should be updated to include how to manually build for SLES and Ubuntu.