Update dependencies

[Sgiath]

• added flake.nix for dependency install
• updated dependencies to their latest versions, except:
  • phantom-js as a whole project is deprecated, and so are the run-browser and zuul packages that are using it (I could not even install it with the latest Node). I was not sure what to replace it with and since it was used only for tests I removed it completely (since we are not even running the tests in CI).
• one test was failing on .item() not being present on the object so I changed it to [] which should be equivalent according to MDN
• then one test failed on assertion. After inspecting the test I concluded that it was a bad test so I fixed the code for the test and now it is passing

I am not JS dev though I don't know what this library does so someone should check it before merging!

https://app.shortcut.com/crazyegg/story/48069/review-categorize-and-update-repos