Improve Self host setup (#30)

* Add self host setup

* Improve blunders

* Move to bull mq

* More changes

* Add example code for sending test emails

.env.selfhost.example

@@ -0,0 +1,30 @@
+# Redis container name
+REDIS_URL="redis://redis:6379"
+
+# Postgres
+POSTGRES_USER="postgres"
+POSTGRES_PASSWORD="postgres"
+POSTGRES_DB="unsend"
+DATABASE_URL="postgresql://postgres:postgres@postgres:5432/unsend"
+
+# NextAuth
+NEXTAUTH_URL="http://localhost:3000"
+NEXTAUTH_SECRET=
+
+# Github login
+GITHUB_ID="<your-github-client-id>"
+GITHUB_SECRET="<your-github-client-secret>"
+
+# AWS details
+AWS_DEFAULT_REGION="us-east-1"
+AWS_SECRET_KEY="<your-aws-secret-key>"
+AWS_ACCESS_KEY="<your-aws-access-key>"
+
+
+ 
+DOCKER_OUTPUT=1
+NEXT_PUBLIC_IS_CLOUD=false
+API_RATE_LIMIT=1
+
+# used to send important error notification
+DISCORD_WEBHOOK_URL=""