Update order of _toc.yml and add download button for data

Author: liamjberrisford

_toc.yml

@@ -139,8 +139,8 @@ parts:
                   - file: individual_modules/python_for_data_analysis/Python_Matplotlib
                   - file: individual_modules/python_for_data_analysis/Python_ScikitLearn
                   - file: individual_modules/python_for_data_analysis/data-analysis-plotly
-                  - file: individual_modules/python_for_data_analysis/Python_Testing
                   - file: individual_modules/python_for_data_analysis/data-analysis-task
+                  - file: individual_modules/python_for_data_analysis/Python_Testing
                   - file: individual_modules/python_for_data_analysis/Python_Language_features
           - file: course_homepages/R
             sections:

individual_modules/python_for_data_analysis/data-analysis-task.ipynb

@@ -14,7 +14,10 @@
     "\n",
     "This notebook is a longer exercise for students to complete in the third session of Python for Data Analysis. It has been designed to try to replicate the process of starting a new data analysis project.\n",
     "\n",
-    "The data set used in this example is the `The Database of British and Irish Hills v18` and is freely available under a Creative Commons Attribution 4 License, at `https://www.hills-database.co.uk/downloads.html`. This data set contains grid reference information for peaks, hills, and cols in Britain."
+    "The data set used in this example is the `The Database of British and Irish Hills v18` and is freely available under a Creative Commons Attribution 4 License, at `https://www.hills-database.co.uk/downloads.html`. This data set contains grid reference information for peaks, hills, and cols in Britain.\n",
+    "\n",
+    "## Download Data\n",
+    "[Click Here to Download Data File to Local Space](data/DoBIH_v18.csv)"
    ]
   },
   {