Decouple Cboard from third parties

[lutangar]

• [ ] Sendgrid
• [ ] Facebook SSO
• [ ] Google SSO
• [ ] Google Analytics (is GA used by Cboard stats page ?)
• [ ] Google adsense
• [ ] Azure
  • [ ] blob storage (see #2 )
  • [ ] speech
• [ ] IPinfo

[lutangar]

I discovered yet another dependency to a third party...

@JeromeGutman could you create an IPinfo account in the name of @ERASME-GL please ? https://ipinfo.io/signup

[lutangar]

Our current work in progress has been submitted to the CBoard community via :

• https://github.com/cboard-org/cboard-api/pull/233
• https://github.com/cboard-org/cboard/pull/1290

In the current state it allows Interpretable to move toward self hosting but it still misses :

• [ ] Discussion with CBoard community to make the configuration compatible with their work
• [ ] Documentation of the newly introduced environment variables
• [ ] Resolve security issue in #2