Load vanity urls from yaml configmap

[bbengfort]

Scope of changes

Loads vanity URLs from a config map. This is a simple way of defining what URLs we want loaded -- in the future though we should scan our GitHub repository routinely to find new modules.

Type of change

• new feature
• bug fix
• documentation
• testing
• technical debt
• other (describe)

Acceptance criteria

This PR will be merged without review.

Definition of Done

• I have manually tested the change running it locally (having rebuilt all containers) or via unit tests
• I have added unit and/or integration tests that cover my changes
• I have added new test fixtures as needed to support added tests
• I have updated the dependencies list if necessary (including updating yarn.lock and/or go.sum)