This is to prevent accidental updates of hyperdata with other JSON
structs.

The bug was introduced in

!177 (diffs)

It caused hyperdata to be updated with whole corpus, serialized, hence
hyperdata inside hyperdata.

We need to fix them properly as part of #198.

This commit fixes the `testWithQueryFrontend` test, which was broken by

6bc41d73

However, this was followed by a frontend fix, which was modified to deal
with the next format:

purescript-gargantext!374 (diffs)

Therefore, it's fine to fix the test here.

Merge remote-tracking branch 'origin/239-readme-test-reinstall-project-with-cabal-and-update-the-readme-file' into dev-merge

This commit removes the 'cache:key:files' directive because our CI's
gitlab is currently too old to support it.