For some reason the default language (namely EN) was ignored when reading
the configuration file. After discussion with anoe, it appears that
this exclusion happens for historical reasons, so this commit removes it.

`gargantext-cli ini` now takes two optional arguments:
- `--ini-path somefile.ini`: will read the configuration from `somefile.ini`.
  Defaults to `gargantext.ini`
- `--toml-path somefile.toml`: will write the configuration converted to TOML
  into `somefile.toml` (warning: it will erase the former file if there is already one!)
  Defaults to `gargantext-settings.toml`

Since it writes to a file, the command no longer outputs the configuration
to standard output.

Remove allow-newer:*, allow-older:* in cabal.project file and instead
list these explicitly. This is a big step for managing dependencies.

Maybe TBQueue is broken on CI:
https://github.com/haskell/stm/issues/76

Also, changed exceptions to safe

- Re-enable orphan warnings that were manually disabled in many modules
- Remove non-Haskell files that were just sitting in the source tree
- Remove modules that were not called from anywhere
- Remove unused dependencies

This is not exhaustive by any means. In particular, some more weeding out
can be achieved by looking at individual functions and even branches of
functions. Weeder can help with that.

Merge remote-tracking branch 'origin/393-api-openalex-fix-adapt-ngrams_url-field-following-an-api-change-causing-an-externalapierror' into dev

Also, set gargantext-settings.toml as the default file