Issues in setup guide

[simon-ball]

Several issues with the Setup stage

• The links point to the location in a github repository, not to the raw files themselves
  The CSV link currently goes to https://github.com/iaine/humanities-lesson-data/blob/master/data/openrefine/openrefine.csv
  It should ideally point to the raw equivalent, https://raw.githubusercontent.com/iaine/humanities-lesson-data/master/data/openrefine/openrefine.csv
  That would allow users to either save the web page, or right-click -> save as, instead of having to navigate the Github interface. Likewise for the .db file
• The guide says nothing about where to download these files to. Obviously, that depends a bit on the user's local environment. However, the user needs to know where it is relative to their notebook in order to open the files.
  On Windows 10, the default download location is C:\Users\<USERNAME>\Downloads\, while most likely, Jupyter will be opened from C:\Users\<USERNAME>\ (i.e. the home directory). This probably just needs a warning that the user needs to know where the file is, but since Windows 10 actively hides the real path of folders like Downloads, it is a likely pain point for inexperienced users.
• Workshops 7 and 9 specify using bokeh and sqlite Python libraries which are not included in the installation step, and are not installed by default (in a fresh conda environment, at least) . Both are available via the conda-forge channel, so can be included in the same line with ggplot
• ggplot doesn't seem to be used at all. It's installed in the setup, referenced in workshop 7 (plotting with bokeh) and never used.