addresses #15, missing image added

_config.yml

@@ -53,7 +53,7 @@ launch_buttons:
 
 repository:
   url                       : https://github.com/astropy/ccd-reduction-and-photometry-guide  # The URL to your book's repository
-  path_to_book              : "notebooks"  # A path to your book's folder, relative to the repository root.
+  path_to_book              : ""  # A path to your book's folder, relative to the repository root.
   branch                    : main  # Which branch of the repository should be used when creating links
 
 #######################################################################################

notebooks/01-00-Understanding-an-astronomical-CCD-image.ipynb

@@ -20,7 +20,14 @@
     "*why* pixel values are not directly proportional to light is useful before\n",
     "diving into the details of image reduction."
    ]
-  }
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "![alt text](../book_media/images/jw02107-o039_t018_miri_f770w_i2d.png)"
+   ]
+  } 
  ],
  "metadata": {
   "kernelspec": {