Fixes to servedocs (+minor release)

[tlienart]

closes #125
closes #126

Testing

• Ran servedocs(skip_dir="docs/src/generated") on the Literate.jl repo, modified outputformats.md (picked up ✔️) modified outputformats.jl (picked up ✔️)

@fredrikekre I intend to merge this soon but there's one element I'd like your opinion on, could you ran the following example with this branch:

using LiveServer, Documenter, Literate
LiveServer.servedocs_literate_example()
cd("servedocs_literate_example/")
servedocs(literate=joinpath("docs", "literate"))

There's a bunch of <unknown> added e.g.:

```@meta
EditURL = "<unknown>/docs/literate/man/pg1.jl"
```

I think this comes from Literate. It looks like stuff works fine but it shows a bunch of warnings in the REPL. Anything that could be done to maybe disable some checks on that front? or is it a Documenter issue? Thanks!

[fredrikekre]

Great, thanks.

I think this comes from Literate.

Yep, and those are expected to be <unknown> unless running on GH Actions or similar.

Anything that could be done to maybe disable some checks on that front?

I mean, you can filter out those log messages I suppose, but personally I am not bothered by them since I am generally not looking at that terminal window anyway. It is also happening from just julia docs/make.jl so people using Literate have probably already seen them. I don't think it is LiveServers job to hide them.

[tlienart]

Sounds good, thanks for the clarifications