Collection handle /similar endpoint

[adamjarling]

What does this do?

Updates the IIIF homepageUrl() creator function to generate a URL which includes a ?similar= query param. DC's Search page will recognize this similar param and build it's Search query object to include similar Works from the index.

A url like this:

https://dcapi.rdc-staging.library.northwestern.edu/api/v2/works/f2e42c77-b7da-4632-bd87-5a65bf096afb/similar?collectionLabel=More Like This&collectionSummary=Similar%20to%20v1-indexing-test-work&as=iiif

Should return something like this in the IIIF Manifest:

{
  ...
  homepage: {
    id: "https://dcapi.rdc-staging.library.northwestern.edu/search?similar=f2e42c77-b7da-4632-bd87-5a65bf096afb",
    ...
  }
}