Cerulean 2 upgrades

[sekjal]

1. Move processing from PHP-ETL to N8N; better user interface, more complex workflows possible, can be independently scaled
2. Implement analysis with Metabase
3. Use CMS Silverstripe module to provide partner-facing interface, allowing data experts to login and view content in a customizable GUI (instead of requiring SS admin viewing)

• Use Elemental and UserForms modules
• enable embedding of Metabase reports in pages

4. Wire it all together so every bit talks to what it needs to