Refactor DI documentation

[marcosschroh]

It seems that the Stream DI section is getting bigger and difficult to read.

Should each DI option has its own section? How can we make it more readable?

[Masqueey]

Maybe you could add the other sections as page subsections? Or at least add the Stream DI section as a subpage of Streams? A bit like the above image, where User Guide would then be Streams and one of the subpages would be Dependency Injection.