Discuss: 'all' JavaScript should not auto initialise, and export individual components

[NickColley]

At the moment if you import 'all' it'll initialise automatically.

Should it instead do the following:

<script src="all.js"></script>
<script>
  govukFrontend.initAll()
</script>

and

<script src="all.js"></script>
<script>
  govukFrontend.Checkboxes.init()
</script>

[NickColley]

Adam has an interesting article on this: https://adamsilver.io/articles/dont-initialise-javascript-automagically/

[NickColley]

After integrating the JavaScript into the design system, I think this is definitely something we should consider.

[NickColley]

Closed with #759