Database Setup: add links to jump to database sections

Author: cahofmeyr

installation/database-setup.mdx

@@ -1,9 +1,11 @@
 ---
 title: "Source Database Setup"
-description: "Configure your backend database for PowerSync"
+description: "Configure your backend database for PowerSync."
 sidebarTitle: "Overview"
 ---
 
+Jump to: [Postgres](#postgres) | [MongoDB](#mongodb) | [MySQL](#mysql-alpha)
+
 import PostgresPowerSyncUser from '/snippets/postgres-powersync-user.mdx';
 import PostgresPowerSyncPublication from '/snippets/postgres-powersync-publication.mdx';