Add postgresql history page from the official docs (#7010)

* Add postgresql history page from the official docs

I brief historical view of Postgresql that might introduce new developers to Berkeley Labs to look up the projects from there.

* Update src/data/roadmaps/postgresql-dba/content/introduction@lDIy56RyC1XM7IfORsSLD.md

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Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>

src/data/roadmaps/postgresql-dba/content/introduction@lDIy56RyC1XM7IfORsSLD.md

@@ -1,3 +1,5 @@
 # Introduction to PostgreSQL
 
 PostgreSQL is a powerful, open-source Object-Relational Database Management System (ORDBMS) that is known for its robustness, extensibility, and SQL compliance. It was initially developed at the University of California, Berkeley, in the 1980s and has since become one of the most popular open-source databases in the world.
+
+- [@article@History of POSTGRES to PostgreSQL](https://www.postgresql.org/docs/current/history.html)