[Feature Request] Allow Agency customers to provide additional links

The customer would like to be able to replicate the 'Documentation' link we have (where they can provide a link to their own docs), and expand this to provide a link to their own Zapier app they have created - so when visiting 'Zapier' under 'Deployment', we would display a link to their own Zapier app. Payment tier: Enterprise Severity level: 2 - High (P2) - High-impact issues affecting functionality for multiple users, but with available workarounds.