Fixes

[sharknoon]

Hello Umbrel Team,

I have found some issues in some apps:

• Calibre Web: According to the schema, the website entry is mandatory. Other apps without a website used the GitHub repo as the website. So I have aligned that
• LN Visualizer: The type of the support entry seems to be a link. All the other apps are using it as a link, therefore I have added a mailto: to the email to be a valid link and be clickable
• Prowlarr: A missing newline

Thank you so much for your awesome work on UmbrelOS, I am really loving it. I am exited for future features like https, domain names and backups 😍

Kind regards from Germany

Sharknoon