Allow adding custom javascript to the page. Closes #2604

controllers/customJavascript.go

@@ -0,0 +1,13 @@
+package controllers
+
+import (
+	"net/http"
+
+	"github.com/owncast/owncast/core/data"
+)
+
+// ServeCustomJavascript will serve optional custom Javascript.
+func ServeCustomJavascript(w http.ResponseWriter, r *http.Request) {
+	js := data.GetCustomJavascript()
+	w.Write([]byte(js))
+}