remove old stacks

build.rs

@@ -0,0 +1,7 @@
+fn main() {
+    // trigger recompilation when a new migration is added
+    println!("cargo:rerun-if-changed=migrations");
+
+    // recompile when javascript changes, as it's embedded in the binary
+    println!("cargo:rerun-if-changed=js");
+}