fixes the broken links for images

02_bcce_2024.ipynb

@@ -120,7 +120,7 @@
     "\n",
     "Consider the molecule ethanol. The image below shows a representation that we are used to seeing in chemistry:\n",
     "\n",
-    "![ethanol](Images/ethanol.png)\n",
+    "![ethanol](images/ethanol.png)\n",
     "\n",
     "However, the SMILES representation of this molecule would be \"CCO\".\n",
     "\n",
@@ -161,11 +161,11 @@
     "### SMILES Examples\n",
     "\n",
     "<div style=\"text-align:center;\">\n",
-    "  <img src=\"Images/smiles_example_1.png\" style=\"display: block; margin: 0 auto; max-height:300px;\">\n",
+    "  <img src=\"images/smiles_example_1.png\" style=\"display: block; margin: 0 auto; max-height:300px;\">\n",
     "</div>\n",
     "\n",
     "<div style=\"text-align:center;\">\n",
-    "  <img src=\"Images/smiles_example_2.png\" style=\"display: block; margin: 0 auto; max-height:300px;\">\n",
+    "  <img src=\"images/smiles_example_2.png\" style=\"display: block; margin: 0 auto; max-height:300px;\">\n",
     "</div>\n",
     "\n",
     "### Using Online Resources\n",
@@ -646,7 +646,7 @@
     "The next step after the data preparation is to build and train our random forest regression model. A random forest is a decision tree model that uses a \"forest\" of multiple decision trees and randomly chooses which variables to use in each tree. Generally, each individual tree is not that good at making a prediction, but collectively the trees are quite good at making predictions. Note that each tree predicts an individual value and then a vote is taken (in the case of regression, an average of the predicted values) to determine the final predicted value.\n",
     "\n",
     "<div style=\"text-align:center;\">\n",
-    "  <img src=\"Images/Random_forest_explain.png\" style=\"display: block; margin: 0 auto; max-height:400px;\">\n",
+    "  <img src=\"images/Random_forest_explain.png\" style=\"display: block; margin: 0 auto; max-height:400px;\">\n",
     "</div>\n",
     "\n",
     "### Hyperparameters\n",