Revert "chore: move encrypted tokens to environment variables"
Revert "chore: move encrypted tokens to environment variables"

This reverts commit d5330e20ba624bed14f70458b222a94b1fe0e126.

sendgrid/sendgrid-go,VividCortex/sendgrid-go,karmakaze/sendgrid-go,karmakaze/sendgrid-go,VividCortex/sendgrid-go,sendgrid/sendgrid-go