Request to rename OpenAPI file

[dunnl]

The API specification file is currently named openapi.yaml. I would like for this file to be renamed to something like eidodeference.yaml that reflects the purpose of the API being defined, which is common in other NENA-owned repos. For instance, the Logging Service OpenAPI document is named loggingservice.yaml.

The issue isn't purely aesthetic. I am hosting HTML documents here and the script to generate these documents encounters an error because the Routing Policy document is also named openapi.yaml. The reason this creates an error has to do with weedy technical details in how I'm handling to $ref fields throughout NENA documents, which need to be dereferenced to produce the documentation.