Obsidian: Remove underscores in filenames and directories

[sojusnik]

If a Zim filename or a directory has a space between words, then currently after conversion with this script the space will be replaced with an underscore. This makes the note titles ugly, same goes for directories. I assume this was done to avoid problems with linking.

Those underscores aren't necessary, because when using Wikilink style linking, those space are taken into account.

This is how a proper an internal Wikilink style link looks in Obsidian:
I'm linking to a [[a category with spaces/a note with spaces|note]] with several spaces

But in Markdown style links, spaces must be replaced with %20, as described here:
I'm linking to a [note](a%20category%20with%20spaces/a%20note%20with%20spaces.md) with several spaces