feat: file-explorer working example with v0.5

[tkr-sh]

I modified the example of the file explorer so it works with dioxus 0.5 Also I fixed the fact that before an element was determined as a file or dir based on its name: if it had a . in it. That's a bad idea because:

• File can have no extensions (e.g. executables (e.g. /usr/bin/*))
• A directory can have a dot (e.g. mkdir -p this.is.a.test)

The good way to know if something is a file or a directory is to look that with the permissions (a one if it is a directory, a zero if not). This is used with the simple:

 file.file_type().unwrap().is_dir()

[tkr-sh]

Thanks! Appreciate the changes ^^