docs: add email config (#191) (#210)

docs/email_setup.md

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+# Configuring Emails
+
+There are several configuration options in `config/default.json`
+
+## Email Relay Configuration
+- mail_provider:
+  * `console`
+  * `smtp`
+- mail_smtp_host:
+  * the IP address or FQDN of your SMTP email relay
+- mail_smtp_port:
+  * the port used to connect to the email relay
+- mail_smtp_secure: true
+  * whether to use TLS when connecting to the SMTP email relay
+- mail_smtp_require_tls:
+  * `true`: attempt to use TLS even if the email relay doesn't advertise it, don't send the email if TLS isn't supported
+  * `false`: permits emails to be sents without using TLS
+- mail_smtp_user:
+  * the username for the SMTP email relay.
+  * comment out this line for an email relay that doesn't use authentication
+- mail_smtp_pass
+  * the password for the SMTP email relay
+  * comment out this line for an email relay that doesn't use authentication
+
+## Content of Emails
+
+- teamname:
+  * the team name appears on the emails sent by your spacedeck
+- contact_email:
+  * the email address that appears on emails being sent by your spacedeck
+- endpoint:
+  * the URL that users click on in the emails being sent by your spacedeck