make dev setup better (#116)

* make dev setup better

* chage docs

* remove the need of github login

.env.selfhost.example

@@ -12,10 +12,15 @@ DATABASE_URL="postgresql://postgres:postgres@postgres:5432/unsend"
 NEXTAUTH_URL="http://localhost:3000"
 NEXTAUTH_SECRET=
 
+## Auth providers any one is required
 # Github login - required
 GITHUB_ID="<your-github-client-id>"
 GITHUB_SECRET="<your-github-client-secret>"
 
+# Google login - required
+GOOGLE_CLIENT_ID="<your-google-client-id>"
+GOOGLE_CLIENT_SECRET="<your-google-client-secret>"
+
 # AWS details - required
 AWS_DEFAULT_REGION="us-east-1"
 AWS_SECRET_KEY="<your-aws-secret-key>"