DX-196; use axiom ingest endpoints

[schehata]

• Separate vercel, netlify and generic config handlers
• ensure all variables work with vercel deployments
• ensure all variables work with netlify deployments
• find a way to pass auth through navigator.beacon (didn't work, beacon will only be used with verbal for now)
• review namings and code structure
• update README/docs for vercel and non-vercel usage
• compare verbal schema before and after change
• send web vitals one by one on non-vercel platforms

[vercel]

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Name	Status	Preview	Updated
next-axiom-example	✅ Ready (Inspect)	Visit Preview	Nov 30, 2022 at 7:57AM (UTC)

[schehata]

this is an example of webVital request on netlify platform, I think its missing the request object, but probably this is usually generated by the proxy?

{
  "netlify": {
    "buildId": "6380f7b1da05a646c54a4b5c",
    "context": "production",
    "environment": "production",
    "source": "web-vital"
  },
  "webVital": {
    "id": "v2-1669396643686-4218206098399",
    "label": "web-vital",
    "name": "TTFB",
    "route": "/",
    "startTime": 0,
    "value": 476.00000000000006
  }
}

[bahlo]

awesome work, let's do this 💪