Pre-release v0.0.4

This is a release with everything developed between the release of v0.0.3 and the Big Sur release (which is unfortunately not very much because I'm pretty busy right now).

Some differences:

• Commenting is now available, with detachable popovers. Detach the comment popover to comment while doing something else! The comment popover also has some buttons to help you writing the comments, although they're very preliminary and they'll be better in the future.
• Story voting now works!
• I just worked around the Big Sur text selection bug... so you can now select text from comments and text stories.