DOC: update links

Author: Ray Bell

00_overview.ipynb

@@ -91,13 +91,15 @@
    "metadata": {},
    "source": [
     "*  Reference\n",
-    "    *  [Documentation](https://docs.dask.org/)\n",
+    "    *  [Docs](https://dask.org/)\n",
+    "    *  [Examples](https://examples.dask.org/)\n",
     "    *  [Code](https://github.com/dask/dask/)\n",
-    "    *  [Blog](https://blog.dask.org)\n",
+    "    *  [Blog](https://blog.dask.org/)\n",
     "*  Ask for help\n",
-    "    *   [dask](http://stackoverflow.com/questions/tagged/dask) tag on Stack Overflow\n",
+    "    *   [`dask`](http://stackoverflow.com/questions/tagged/dask) tag on Stack Overflow, for usage questions\n",
     "    *   [github issues](https://github.com/dask/dask/issues/new) for bug reports and feature requests\n",
-    "    "
+    "    *   [gitter chat](https://gitter.im/dask/dask) for general, non-bug, discussion\n",
+    "    *   Attend a live tutorial"
    ]
   },
   {
@@ -182,7 +184,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.3"
+   "version": "3.7.7"
   }
  },
  "nbformat": 4,