Rename "NEXT_PUBLIC_MOONSTREAM_DB_URL" to "NEXT_PUBLIC_MOONSTREAM_DB_API_URL"

[zomglings]

NEXT_PUBLIC_MOONSTREAM_DB_URL is a very scary name, and indicates a direct connection to the database.

What this variable actually contains is the URL of the API that current returns the Moonstream DB status.

[kompotkot]

Also it requires to change name of secret in deployment repository