update data path

Author: gmanchon

content/airbnb-challenge.ipynb

@@ -63,7 +63,7 @@
    },
    "outputs": [],
    "source": [
-    "listings_df = pd.read_csv('https://storage.googleapis.com/introduction-to-data-science/airbnb-dataset.csv')"
+    "listings_df = pd.read_csv('data/airbnb-dataset.csv')"
    ]
   },
   {

content/car-price-prediction-challenge.ipynb

@@ -270,7 +270,7 @@
     }
    ],
    "source": [
-    "cars = pd.read_csv('https://storage.googleapis.com/introduction-to-data-science/car-prices.csv')\n",
+    "cars = pd.read_csv('data/car-prices.csv')\n",
     "cars"
    ]
   },

content/house-price-prediction-project.ipynb

@@ -94,7 +94,7 @@
    },
    "outputs": [],
    "source": [
-    "houses = pd.read_csv('https://storage.googleapis.com/introduction-to-data-science/house-prices.csv')\n",
+    "houses = pd.read_csv('data/house-prices.csv')\n",
     "houses.head()"
    ]
   },

content/spotify-project.ipynb

@@ -66,7 +66,7 @@
    },
    "outputs": [],
    "source": [
-    "df = pd.read_csv('https://storage.googleapis.com/introduction-to-data-science/spotify-dataset.csv')"
+    "df = pd.read_csv('data/spotify-dataset.csv')"
    ]
   },
   {