Add overview

[pdawyndt]

Dolos web interface should display an overview page of the analysis (home page):

• settings
  • programming language
  • number of files
  • k-gram size
  • window size
  • date when analysis was run
• results
  • files that could not be parsed due to syntax errors
  • confirmed cases of plagiarism by manual inspection (# files, # file pairs)

[rien]

This page should be the first page shown to users and should contain actionable information.

As main visualization we could show a histogram which can give a quick impression of the similarities. Showing all intersections would be too much because of the quadratic growth, a single datapoint per file would be better. A good candidate is the highest similarity per file.

[maartenvn]

Closed by #740