moving out outdated js docs

olddocs/js/object-disclaimer.md

@@ -0,0 +1,25 @@
+# Objects disclaimer
+
+Touch Develop docs for the micro:bit.
+
+### Memory management on the micro-bit
+
+New user-defined object types are allocated on the heap and are ref-counted. Our ref-counting algorithm does *not* have a cycle collector. (See Wikipedia.)
+
+### Practical consequences
+
+This means that the following script will result in an out-of-memory error.
+
+![](/static/mb/object-disclaimer-0.png)
+
+```
+while (true) {
+    let l = new List()
+    l.next = l
+}
+```
+
+### How to avoid this?
+
+Don't do it. It's bad.
+