Use JS shortcut for interactive tutorial breadcrumbs

assets/js/interactive-tutorial.js

@@ -0,0 +1,19 @@
+// Helper functions for interactive tutorials
+
+function slugify(s) {
+  const unacceptable_chars = /[^A-Za-z0-9._ ]+/
+  const whitespace_regex = /\s+/
+  s = s.replace(unacceptable_chars, "")
+  s = s.replace(whitespace_regex, "_")
+  s = s.toLowerCase()
+  if (!s) {
+    s = "_"
+  }
+  return s
+}
+
+function complete_step(step_name) {
+  const step_id = slugify(step_name)
+  $(".bc-"+step_id).removeClass("active").addClass("done")
+  $(".bc-"+step_id).next().removeClass("disabled").addClass("active")
+}