What this change accomplishes:
1. Move PostgreSql to Database Section
2. Remove Tips and Trips in PostgreSQL and move to the following
3. Add manage-sql-server.adoc and add GUI for Mysql/MariaDB/PostgreSQL
4. Add install information phpPgadmin because in fedora 33 is out of repo.
Many grammatical fixes and edits to clarify meaning. Missing portions of commands or outputs have been populated. Reformatted code snippets for aesthetic consistency.