Revise display of notebook examples in documentation

This change aims at providing a better overview of the notebooks by displaying them as separate cards instead of a card carousel.

Other changes:
- Introductory examples and Real world-inspired examples are now more prominent with individual images and a grid layout by 2 per-row.
- All other examples are now in a grid layout with 3 examples per row.
- Clear outputs of some notebooks.
- Fix issue with rendering counterfactual example notebook.

Signed-off-by: Patrick Bloebaum <bloebp@amazon.com>

docs/source/example_notebooks/gcm_basic_example.ipynb

@@ -5,7 +5,7 @@
    "id": "b72f7198",
    "metadata": {},
    "source": [
-    "# Basic Example for Graphical Causal Model-Based Intervention"
+    "# Basic Example for Graphical Causal Models"
    ]
   },
   {
@@ -60,7 +60,8 @@
     "pycharm": {
      "name": "#%% md\n"
     }
-   }
+   },
+   "id": "7ec5357c05109df9"
   },
   {
    "cell_type": "code",
@@ -80,7 +81,8 @@
     "pycharm": {
      "name": "#%%\n"
     }
-   }
+   },
+   "id": "fe1b3eff33c5faf8"
   },
   {
    "cell_type": "markdown",
@@ -98,7 +100,8 @@
     "pycharm": {
      "name": "#%% md\n"
     }
-   }
+   },
+   "id": "54e59a824d7fc2d9"
   },
   {
    "cell_type": "code",
@@ -112,7 +115,8 @@
     "pycharm": {
      "name": "#%%\n"
     }
-   }
+   },
+   "id": "ced986f744d8e333"
   },
   {
    "cell_type": "markdown",
@@ -137,7 +141,8 @@
     "pycharm": {
      "name": "#%%\n"
     }
-   }
+   },
+   "id": "ae90eccaf892bb41"
   },
   {
    "cell_type": "markdown",
@@ -210,7 +215,18 @@
     "pycharm": {
      "name": "#%% md\n"
     }
-   }
+   },
+   "id": "68a94da68fba303e"
+  },
+  {
+   "cell_type": "markdown",
+   "source": [
+    "DoWhy offers a wide range of causal questions that can be answered with GCMs. See the user guide or other notebooks for more examples."
+   ],
+   "metadata": {
+    "collapsed": false
+   },
+   "id": "1e7aed4828c843a9"
   }
  ],
  "metadata": {
@@ -234,4 +250,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 5
-}
+}

docs/source/example_notebooks/gcm_counterfactual_medical_dry_eyes.ipynb

@@ -198,10 +198,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "---\n",
     "**NOTE**\n",
-    "It is important that the assigned functional causal models are invertible with respect to the noise (e.g. an additive noise model) for counterfactual statements. Alternatively, the user could also specify the ground truth models and ground truth noise.\n",
-    "---"
+    "It is important that the assigned functional causal models are invertible with respect to the noise (e.g. an additive noise model) for counterfactual statements. Alternatively, the user could also specify the ground truth models and ground truth noise."
    ]
   },
   {
@@ -283,7 +281,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.12"
+   "version": "3.9.16"
   }
  },
  "nbformat": 4,