updates README with new Podman instructions

example.env

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+# The username for authenticating to the local SMTP server
+# Recommended to be the same as REMOTE_SMTP_USER, else the remote may reject it
+LOCAL_SMTP_USER=
+
+# The envelope-from used by the local SMTP server
+# Recommended to be the same as REMOTE_SMTP_USER, else the remote may reject it
+LOCAL_SMTP_ENVELOPE_FROM=
+
+# The host of the remote SMTP server, e.g. smtp.gmail.com
+REMOTE_SMTP_HOST=
+
+# The port of the remote SMTP server: usually 25, 465, or 587
+REMOTE_SMTP_PORT=
+
+# The username for authenticating to the remote SMTP server
+# Usually the email address which will be sending the contact emails
+REMOTE_SMTP_USER=me@joeac.net
+
+# The email address where contact emails will be sent
+CONTACT_MAILBOX=me@joeac.net