Clarify that people should not be relying on free community RPC endpoints for production deployments and they should run their own or rely on service providers with SLAs and provide a list of paid providers

[musalbas]

[jcstein]

I've pinged NewMetric and Numia to see if they'd like to be listed under the paid providers. Are there any others to be added at the moment?

[jcstein]

Provider	URL
NewMetric	https://app.newmetric.xyz/start
Numia	For rpc access: https://docs.numia.xyz/overview/rpc-api-access; For data warehouse access: https://docs.numia.xyz/overview/sql-access/chains/celestia