Updates modules_publishing and modules_installing for PE 3.3.1 release

PMT bug (JIRA PE-5074 and PE-5120) has been fixed. Remove publisher workaround steps. Update upgrading/uninstalling sections with --ignore-changes flag. Add pages specifically to PE docs. Add sidebar navigation for these pages.
The multiple hash marks aren't needed, and I think they'll break the link; you just want one.