Add Folder Navigation to "new Repl" UI/UX

Describe your feature request
When creating a new repl or forking an existing on, in any way (even from the editor!), we really need the ability to choose the folder in which that new/fokred repl will be placed. Some kind of navigation would be standard for document creation UI/UX in most content creation tools. (see word, windows, etc).

What problem(s) would this feature solve?
For organized users who keep repls in multiple folders, this enables proper folder use, rather than dumping repls in a “mystery” locations, or piling them all up in the unnamed, or at the top folder level.

Explain what you were trying to do when you came across the problem leading to this feature request
Forking an existing repl to be used in a different project that belonged in a different folder. Without this feature, the new foked repl lands in the folder of hte original repl, then I need to leave the editor, move the repl, and then go back to editing. This is just one example where a folder selection feature would dramatically save time and clicks for users who really use repl on a regular basis.

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