Update docs for v5.0

[phated]

We need to update the docs (and publish to website) for the v5 release.

[phated]

A couple things I noticed during skimming:

• Need to remove the "ordered globs" docs
• Need to update configuration options to vinyl-fs functions

[yocontra]

Encoding option added: https://github.com/gulpjs/gulp/blob/master/docs/api/src.md#options

[phated]

"Explaining Globs" docs have been updated and a section added with an example for ordered globs using ordered-read-stream: https://github.com/gulpjs/gulp/blob/master/docs/getting-started/6-explaining-globs.md#ordered-globs

[Sebazzz]

Encoding option added: https://github.com/gulpjs/gulp/blob/master/docs/api/src.md#options

Which should be classified as a breaking change, when copying binary files (#2790, #2796).

[yocontra]

@Sebazzz It was a breaking change - its why we released a new major release, and its in the changelog as a breaking change for that major release.