Download URL available for all API entities, not just info

[robbieaverill]

Info pages have access to a downloadUrl if you define one in configuration. Other pages do not. Would you be open to a pull request that allows all entities to access it?

Describe the solution you'd like

I would like the downloadUrl configuration property to be available to all types of API entities, not just the info pages.

Describe alternatives you've considered

Custom Docusaurus config via customFields, although will not be super tidy.

[robbieaverill]

I made a PR for it here anyway - we can close if the change is not desirable: #1094

[robbieaverill]

Added in #1094