docs: Add GlobalX to the list of companies that use Flux

[drewfreyling]

Add GlobalX to list of companies that use it.

[squaremo]

I just changed the formatting of the production users table to make it easier for people to add themselves -- I've rebased this PR and made the same change as your original commit (adding GlobalX to the list, in the appropriate place).

I hope that is OK, @drewfreyling, it's a more intrusive rebase than I would normally do :-) Do you mind quickly redoing the DCO sign-off -- reset to this HEAD, then make sure the commit author lines up with the sign-off (not sure if my rebase upset it or whether it was different before). https://github.com/fluxcd/flux/pull/3358/checks?check_run_id=1464731484 has the details and instructions.

[dholbach]

Thanks @squaremo and welcome @drewfreyling to the Flux community!

[kingdonb]

@drewfreyling Could you please pull --rebase master and sign off this commit for DCO? Then it can be merged. Thanks!

[dholbach]

Thanks a lot!