Always generate links for all searches

[pedro-cf]

Related Issue(s):

• https://github.com/Healy-Hyperspatial/stac-fastapi-mongo/issues/20

Description: Always generate links for all searches, since now base links are generated on the request and no longer stored.

PR Checklist:

• [x] Code is formatted and linted (run pre-commit run --all-files)
• [x] Tests pass (run make test)
• [x] Documentation has been updated to reflect changes, if applicable
• [x] Changes are added to the changelog

[jonhealy1]

Should we have a test for this?

[pedro-cf]

Should we have a test for this?

added