Document Dojo 1/Dojo 2 interop build process

[dylans]

We've been asked a few times now how to build apps that combine Dojo 1 and Dojo 2 code. Note this does not necessarily mean to recommend using webpack with Dojo 1.x (unless there is a good solution for that), but rather to explain how to do a build with an application that combines 1.x and 2.x code.

[dylans]

Note that we do cover parts of this in https://dojo.io/tutorials/1040_dojo1_dijits/ , but the overall feedback I've received from a few sources that have tried this tutorial is that this is not detailed enough for them to know how to proceed.

[matt-gadd]

@dylans can we expand on what parts are currently missing specifically? I just followed the tutorial again (from a stance that I already have some dojo 1 components built), and it seemed to cover everything needed. Are we talking about the inverse of this? ie using Dojo 2 within a Dojo 1 app, rather than using parts of Dojo 1 in Dojo 2?

[dylans]

This needs to be revisited when we're ready to bring this tutorial back.