JavaScript distribution in package

[adamsilver]

We need to create an all.js bundle using rollup (most prob) that bundles together all components into a single file.

Notes:

• jQuery is already in vendor so will be there
• We need to write guidance for setting up JS to run in say JUI or the DS etc. That is we want to make sure vendor/jquery and all.js is added to the right place. (see govuk frontend for a very good starting point).

[adamsilver]

or actually, we just have a really simple concat gulp task to put everything inside all.js—that's possibly all we need to do for a first pass.

It's then just about when the gulp task runs etc.

[adamsilver]

Done