Remove "Downloads" shortcut

In Files, Places, and the file chooser sidebar. As pointed out in “Downloads”, this folder is misleading as people can expect it to be where the downloads from Tor Browser go while it’s not the case.

How complicated would it be to remove it?

Parent Task: #15678

Related issues

Related to #10790

Original created by @sajolida on 15463 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information