Switch to the new company overview

[Nierot]

Please add the following information to your pull request:

Please describe what your PR is fixing
In short, this PR has been open in the private repository for a while, since it was stuck behind the commissioner of external affairs. I've discussed this with the current external, and he would like this page to be live instead of the old list page, since companies have complained about the alphabetical order.

Concretely, which issues does your PR solve? (Please reference them by typing Fixes/References Inter-Actief/amelie#<issue_id>)
Fixes #289 and more specifically PR 507 in amelie-private

Does your PR change how we process personal data, impact our privacy document, or modify (one of) our data export(s)?
no

Does your PR include any django migrations?
no

Does your PR include the proper translations (did you add translations for new/modified strings)?
no, my PR does not include translations

Does your PR include CSS changes (and did you run the compile_css.sh script in the scripts directory to regenerate the compiled.css file)?
no, my PR does not include CSS changes

Does your PR need external actions by for example the System Administrators? (Think about new pip packages, new (local) settings, a new regular task or cronjob, new management commands, etc.)?
no

Did you properly test your PR before submitting it?
yes

[bramvandartel]

Please first make sure that the officer of external affairs updates the 'short description' of all current companies. See /companies/overview

[Kurocon]

Approved, but only merge when we get the OK from the external affairs that all company short descriptions are filled in!

[Nierot]

I got an ack from the external affairs. This can be merged!