Add c-grid figure, actually (#8)

notebooks/intro/crash_course.ipynb

@@ -259,9 +259,11 @@
     "    - w (i, k +/- 1/2)\n",
     "<br>\n",
     "\n",
-    "<i>TODO: Place Grid Visual Aid Here</i>\n",
+    "<img src=\"../images/c-grid_example.svg\" width=500 alt=\"Visualization of the staggered offsets of a C grid. u momentum points exist to the left and right of the mass points, and w momentum points to the top and bottom.\"></img>\n",
+    "\n",
     "<br>\n",
     "\n",
+    "\n",
     "Boundary Conditions\n",
     "- Free-Slip Lower\n",
     "- Rigid Top \n",
@@ -842,7 +844,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "TODO: add holoviews visualization of \"what's going wrong\""
+    "TODO: add holoviews visualization of \"what's going wrong\"\n",
+    "\n"
    ]
   },
   {