Write a summary of user’s interviews

[thom4parisot]

@pzwsk @gracedoherty I wrote the interviews summary here: https://github.com/GFDRR/open-risk-data-dashboard/tree/master/docs/interviews

It is also available from the documentation project, generated out of the docs project: https://gfdrr.github.io/open-risk-data-dashboard/

[thom4parisot]

(a last interview remains to be done, scheduled for March 13th — I will transcribe it as of #413 and update the summary accordingly)

[thom4parisot]

Summary has been updated with #467 and forwarded into the Google Doc.