The Firefly III Data Importer uses the value of `FIREFLY_III_URL` to
constuct links to transactions in email notifications. Since this URL
points to the internal Kubernetes service rather than the canonical URL
used by clients, these links are invalid. Fortunately, there is another
setting, `VANITY_URL`, that the Data Importer will use only when
constructing public-facing links.
Dustin C. Hatch
bfe3523285