Add Evoq to Platform Migration Page(s)/Section

## Description of documentation change
Per @EPTamminga , we should have a way to more easily track, collaborate on, and maintain instructions to aid the ecosystem in migrating former Evoq customers to DNN Platform.

## Existing documentation URL (if applicable)
None exists (publicly) yet.

## Existing documentation section (if applicable)
Developer

## Proposed area for new documentation (if applicable)
Not sure...?

## Additional context
https://dnncommunity.org/forums/aft/86