Feature/email support (#720)

* feat(frontend): ✨ add UI for testing email configuration

* feat(backend): ✨ add email service with common templates (WIP)

* test(backend): ✅ add basic tests for email configuration

* set defaults

* add email variables

Co-authored-by: Hayden <hay-kot@pm.me>

docker-compose.yml

@@ -15,6 +15,16 @@ services:
       - ALLOW_SIGNUP=true
       - API_URL=http://mealie-api:80
 
+      # =====================================
+      # Email Configuration
+      # - SMTP_HOST=
+      # - SMTP_PORT=587
+      # - SMTP_FROM_NAME=Mealie
+      # - SMTP_TLS=true
+      # - SMTP_FROM_EMAIL=
+      # - SMTP_USER=
+      # - SMTP_PASSWORD=
+
       # =====================================
       # Light Mode Config
       - THEME_LIGHT_PRIMARY=#E58325