[feat] Add Screenshots to Service Guides

[kn0wmad]

• [ ] Bitcoin - (#264 is prerequisite)
• [ ] Jellyfin
  • [ ] Linux
  • [x] Mac
  • [ ] Windows
  • [ ] Android
  • [x] iOS
• [x] Lightning
• [x] Matrix
• [ ] Nextcloud
  • [ ] Linux
  • [x] Mac
  • [ ] Windows
  • [ ] Android
  • [x] iOS
• [x] Vaultwarden

[13Homer13]

I will make some screen shots for jellyfin clients on iOS and desktop macOS.