Email generation as part of build process

Moved email source to separate directory, added the task
"generate-emails" to create html files.

mail/email.txt

@@ -0,0 +1,10 @@
+Hi {{ username }},
+
+Someone has recently requests a password reset on Jellyfin.
+If this was you, enter the below pin into the prompt.
+This code will expire on {{ expiry_date }}, at {{ expiry_time }} , which is in {{ expires_in }}.
+If this wasn't you, please ignore this email.
+
+PIN: {{ pin }}
+
+{{ message }}