chore: add BRAND_NAME variable to example environment configuration

Author: mitchdowney

.example.env

@@ -58,6 +58,7 @@ EMAIL_CHANGE_VERIFICATION_PAGE_PATH=/email-change-verifying?token=
 ### NOTE: these are for the *public facing* IP addresses,
 ### not the internal Docker service network or private IP addresses.
 
+BRAND_NAME=Podverse
 WEB_PROTOCOL=http
 WEB_DOMAIN=localhost:3000