Change Bash directive style

Oops, it wasn't that it wasn't finding the file, it was that the first line failed.

render.bash

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -o errexit
+set -o nounset
+set -o pipefail
+set -o xtrace
+
+yarn "build:targets"
+
+PROD='dist/prod'
+if [[ -d "$PROD" ]]; then
+  rm -r "$PROD"
+fi
+mkdir -p "$PROD"
+
+echo 'Rendering webpage...'
+node -e 'import("./dist/server/entry-server.js").then(({render}) => console.log(render().html))' > "$PROD"/index.html
+
+echo "Preparing $PROD..."
+# Copy used assets
+cp -r dist/client/assets "$PROD"/
+cp public/* "$PROD"/
+# Not needed: Pre-rendered
+rm "$PROD"/assets/*.js
+# Not needed: Inlined
+rm "$PROD"/assets/*.css