Create glossary/standard reference for terms/names used in or to describe products/services

Working on the PURLdb RTD, I noticed a variety of ways we refer to the names of services, functions and other concepts in our documentation. See my purldb comment for examples:
- https://github.com/nexB/purldb/pull/450#discussion_r1622877163

It would be useful to create and maintain a glossary of relevant terms and names we can use as a reference.

See also:
- https://github.com/aboutcode-org/scancode-toolkit/issues/2008
- https://github.com/aboutcode-org/federatedcode/issues/35
- https://docs.deps.dev/glossary/
- https://github.com/aboutcode-org/vulnerablecode/issues/816