Test against multiple versions of Postgres (#7176)

* Update ci.yml

* Add Postgis 3.0 test

* remove POSTGRES_MAJOR_VERSION from CI and script

* update docs

* nits

* nit

* Add postgres badges

* Add Postgres to TOC

* Shorten mongo and postgres descriptions

* Add badge for node, update mongo/postgres badges

* Add nodejs to TOC

* fix node js TOC

* Nit

* more nits

scripts/before_script_postgres.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-echo "[SCRIPT] Before Script :: Setup Parse DB for Postgres ${POSTGRES_MAJOR_VERSION}"
+echo "[SCRIPT] Before Script :: Setup Parse DB for Postgres"
 
 PGPASSWORD=postgres psql -v ON_ERROR_STOP=1 -h localhost -U postgres <<-EOSQL
     CREATE DATABASE parse_server_postgres_adapter_test_database;