Feature/gulpfile optimisations

[khawkins98]

This does a couple things:

1. Namespaces the gulp commands so that they won't conflict if the gulpfile is being included in another project
   • also updates docs to say "use gulp vf-dev"
2. Makes better use of variables to set the component path for sass, js, etc.

Both of these will be of particular importance to things like vf-eleventy ... a separate PR to come there.

Keeping this as a draft until the vf-eleventy stuff is prepped.

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[sturobson]

as in you're in gulpfile.js do you want to take on #324 as I've not assigned it to me yet?

[khawkins98]

👍 snagged that task and assigned to myself.