Ignored `EditURL`s in `@meta`-block

[agdestein]

Literate.jl automatically converts .jl files to Documenter .md files.
This adds something like the following block in top of the .md file:

```@meta
EditURL = "../../../examples/script_source_file.jl"
```

When the files are then built with normal Documenter, clicking the Edit this page redirects to script_source_file.jl instead of generated_markdown_file_which_does_not_exist.md (this can be tried on the link on this page which redirects to this source file).

With DocumenterVitepress, this EditURL seems to be ignored, see for example the Edit this page on GitHub button at the bottom of the Literated page https://lux.csail.mit.edu/stable/tutorials/beginner/1_Basics which should point to https://github.com/LuxDL/Lux.jl/blob/main/examples/Basics/main.jl.

[asinghvi17]

Ah that's the problem I'm getting. Should be fixable, I don't think DV looks at page.meta yet.

[asinghvi17]

It looks like Vitepress doesn't allow per-page editURL config, so the best option here might be to do it ourselves...

[avik-pal]

We might have to parse all the meta blocks accumulate the edit links and insert a function like https://vitepress.dev/reference/default-theme-edit-link

[asinghvi17]

Ah I missed that part of the docs! That should be easy then - we already have that in each page.meta.