Add Flux deployment kustomization

[stefanprodan]

Add docs with Kustomize install instructions

[hiddeco]

I think this no longer makes the get started tutorial accessible to completely newcomers, instead I would make this either an extended part of this tutorial as a section or a follow up tutorial in a new document.

[stefanprodan]

I think the opposite. Instead of pulling the whole Flux repo and editing files, now you can just copy/past/run the instructions, way easier and clean in my opinion.

[hiddeco]

@stefanprodan agreed, but you no longer understand what happens, just that it works.

[squaremo]

Only comments for the minute ..

[squaremo]

With respect to whether this is a good way to show people how to install flux for the first time:

• I agree with Hidde that a tutorial should aim to instruct
• I don't think using using Kustomize gets in the way of instructing, especially (or that getting people to edit files was superior on that count, necessarily). But it might need a bit of explanation of why things are being done.
• If using Kustomize is to be preferred -- we're effectively recommending it, here -- we might need to revisit some other bits of doc as well.

[stefanprodan]

@squaremo @hiddeco I've moved the Kustomize install docs to a dedicated section and I've added the two example repos as next steps.

[hiddeco]

Not sure if this was already there or is new, but my thought while reading this was "can be tweaked easily how?"

[stefanprodan]

This was already there. Let's address it in #2298

[hiddeco]

LGTM, thanks Stefan 🔥