Add email signup feature

src/main.rs

@@ -149,6 +149,10 @@ Then try to restart Plume.
                 routes::comments::create,
                 routes::comments::delete,
                 routes::comments::activity_pub,
+                routes::email_signups::create,
+                routes::email_signups::created,
+                routes::email_signups::show,
+                routes::email_signups::signup,
                 routes::instance::index,
                 routes::instance::admin,
                 routes::instance::admin_mod,