Add filters documentation

[mkitti]

Fix #893

[mkitti]

@simonbyrne would you like to take a look at the documentation for the HDF5 filters interface?

[mkitti]

Let's just merge this. It is is easier to review and iterate after CI has generated and deployed the docs.

[simonbyrne]

You can enable push_preview in documented which will build preview docs for PRs

[musm]

You can enable push_preview in documented which will build preview docs for PRs

https://github.com/JuliaIO/HDF5.jl/blob/master/docs/make.jl#L39

It's enabled, but won't work across forks.

[mkitti]

We'll either need to dev the the plugin packages into the documentation environment or release new versions of them. Which do you prefer?

[musm]

Hmm, I don't have a strong preference for either.

I think I'll just bump every filter package and HDF5 in the next round, and that'll sync them up.

[simonbyrne]

In other cases where I've had sub packages, I've found it easier to check in the Manifest.

[mkitti]

OK, I pushed my branch within the repository with a Manifest.toml: #903.