Filter files shown in "Open a notebook"

[jotas6]

I am not sure if this is desirable, but I found the current behavior somewhat inconvenient and couldn't find a similar issue, so I thought I would open it for discussion.

Currently, when opening a notebook, we are shown all the files in the present working directory, even if they can't be opened by Pluto (e.g. if I try clicking on one of the images, I get a screen saying that the file can't be opened)

Given that all files look somewhat the same, I have found myself spending some time looking through all the files every time I want to open the notebook, which has been somewhat inconvenient in my view. My thinking is that we could add some filter (e.g *.jl) to only show the files that could be opened by Pluto.

I have never contributed here, but I am happy to help if pointed in the right direction.

Thank you for Pluto!