chore: update frontend dependencies

[fimion]

We need to switch from bootstrap 3 to 4, and upgrade dependencies for JS as needed.

[jacques-cadet]

Will do ASAP.

…

On Mon, Oct 28, 2019 at 10:59 PM Alex Riviere ***@***.***> wrote: We need to switch from bootstrap 3 to 4, and upgrade dependencies for JS as needed. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#55?email_source=notifications&email_token=AE6HZQRYIR3NHGQKGPXABR3QQ6RJPA5CNFSM4JGCXXK2YY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4HU54LNQ>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AE6HZQU6DVSBCYSTHIT4NK3QQ6RJPANCNFSM4JGCXXKQ> .

[pryelluw]

Pull request #57 includes new code that uses bootstrap 4.
It introduces a new base layout template for the pyatl app templates.