v0.2.1

Fixes

• Welcome screen no longer links to the Networks page when the authtoken is missing (#23)
• On Windows, the file path for where to find Zerotier One's copy of the authtoken file should now be correct (#23)
• Added clarifying information when the device attempts to join a network but access is denied (#23)
• Added a more visible close button to the "Join a Network" panel (#23)
• Added OS information to the Node Info card on the Home page (#23)
• Replaced the navbar's "Home" button with a logo-and-name brand for visual consistency with navbars in other Sargassum apps (#23)