OPS Priority: Serverless deprecations need to be addressed ASAP

[lanaebk]

• Deprecation warning: Detected ".env" files. Note that Framework now supports loading variables from those files when "useDotenv: true" is set (and that will be the default from next major release) More Info
• Deprecation warning: Starting with next major version, default value of provider.lambdaHashingVersion will be equal to "20201221" More Info
• Deprecation warning: Starting with next major version, API Gateway naming will be changed from "{stage}-{service}" to "{service}-{stage}". Set "provider.apiGateway.shouldStartNameWithService" to "true" to adapt to the new behavior now. More Info
• Deprecation warning: Starting with next major version, API Gateway-specific configuration keys "apiKeys", "resourcePolicy" and "usagePlan" will be relocated from "provider" to "provider.apiGateway" More Info