install: move postgreql driver out of web-app's lib-path and adds README about...

install: move postgreql driver out of web-app's lib-path and adds README about its install under tomcat lib/

java-libs/README.postgresql-jar

+
+
+postgresql-*.jar library should be loaded by tomcat: place it to its tomcat's classpath: .../tomcat/lib/
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+Note access rights and ownership: tomcat:tomcat
+
+-rw-r-----. 1 tomcat tomcat 825943 Mar 23 08:03 /opt/tomcat/latest/lib/postgresql-42.2.5.jar
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+also schema in URL access should be: jdbc:postgresql (not only postgresql://)
+
+jdbc:postgresql://127.0.0.1:5432/vialactea
+
+
+Manual: https://jdbc.postgresql.org/documentation/use/
+
+