Create a simple mechanism for deprecating an API

[newgene]

Could be something like this in the config file:

DEPRECATED  = True
DEPRECATION_MESSAGE = "..."
DEPRECATION_REDIRECTION= "<redirection_url>"

Then the API landing page shows deprecation msg and redirect to a new URL in 10s.

[colleenXu]

Other APIs to remove?

All of the semmed APIs below could maybe be removed, since they are replaced by semmeddb...

• semmed
• semmed_anatomy
• semmedbp
• semmedchemical
• semmedgene
• semmedphenotype

Maybe umlschem? I'm not sure where that's from...

And we have confirmation from Text Mining team (internal Translator Slack link) that they don't need the BioThings text mining co-occurrence API anymore...

[erikyao]

Also consider "DEPRECATED_DATE", after which the API is not accessible (redirected to elsewhere)