#103 Readme Fixes - Githubissues

Minor readme updates. Closes #103 plus a few out of scope changes

Changed CentOS -> RHEL (more technically correct) and instructions for dnf package manager
Updated git links
Removed ssh-agent mentions (not used)
Changed clone to refer to HTTPS instead of SSH
Regenerated PDF so that it's up to date

kblincoe / VisualGit_SE701_2019_1