Re-level non-docs content to top of repo and rename content→docs

@theme/helpers.ts

@@ -0,0 +1,66 @@
+/**
+ * Slugify function, has to match the formula used in interactive-tutorial.js
+ */
+import { useEffect, useState } from 'react';
+
+export const useThemeFromClassList = (classNames) => {
+  const [currentTheme, setCurrentTheme] = useState(null);
+
+  useEffect(() => {
+    // Function to update the theme based on the class list
+    const updateTheme = () => {
+      for (const className of classNames) {
+        if (document.documentElement.classList.contains(className)) {
+          setCurrentTheme(className);
+          return;
+        }
+      }
+    };
+
+    // Initial update
+    updateTheme();
+
+    // Create an observer instance linked to the callback function
+    const observer = new MutationObserver(() => {
+      updateTheme();
+    });
+
+    // Start observing the target node for configured mutations
+    observer.observe(document.documentElement, {
+      attributes: true, // Listen for attribute changes
+      attributeFilter: ['class'], // Specifically, listen only to "class" attribute changes
+    });
+
+    // Cleanup: Disconnect the observer
+    return () => {
+      observer.disconnect();
+    };
+  }, [classNames]);
+
+  return currentTheme;
+};
+
+export function slugify(s) {
+  const unacceptable_chars = /[^A-Za-z0-9._ ]+/g;
+  const whitespace_regex = /\s+/g;
+  s = s.replace(unacceptable_chars, "");
+  s = s.replace(whitespace_regex, "_");
+  s = s.toLowerCase();
+  if (!s) {
+    s = "_";
+  }
+  return s;
+}
+
+export function idify(s: string) {
+  // like slugify, but more unicode-friendly.
+  // for some reason the better version using \p gives an "s12 is undefined" TypeError sometimes,
+  // so it's disabled for now. With that fixed, we could use localized step names in interactive tutorials.
+  //s = s.replace(/[^\p{Alphabetic}\p{Mark}\p{Decimal_Number}\p{Connector_Punctuation}\p{Join_Control}]/gu, '').trim().toLowerCase()
+  s = s.replace(/[^\w\s-]/gu, '').trim().toLowerCase()
+  s = s.replace(/[\s-]+/gu, '-')
+  if (!s) {
+    s = "_";
+  }
+  return s
+}