Documentation update request - add mjml tooling

Hi,

we've created a Mjml custom content block that works with Salesforce Marketing Cloud and would like to list it under the tooling section.

https://documentation.mjml.io/#tooling

App installation link: https://appexchange.salesforce.com/listingDetail?listingId=a0N3u00000Qt1wTEAR App installation details: https://info.cloudkettle.com/mjml-live-editor