revert: Allow postgres connections that require ssl mode (#408)

This reverts commit d627a5660a.

server/db/knexfile.js

@@ -8,12 +8,7 @@ dotenv.config({
 
 module.exports = {
   client: 'pg',
-  connection: {
-    connectionString: process.env.DATABASE_URL,
-    ssl: {
-      rejectUnauthorized: false,
-    },
-  },
+  connection: process.env.DATABASE_URL,
   migrations: {
     tableName: 'migration',
     directory: path.join(__dirname, 'migrations'),