Support external repositories

[dnet890]

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Describe the bug With tachiyomi terminated their central repository. It is important that this is important to browse for manga

https://tachiyomi.org/news/2024-01-09-extensions-removal

To Reproduce Steps to reproduce the behavior:

1. Go to application
2. We can't look for manga anymore

Expected behavior We should browse for manga easily

Screenshots If applicable, add screenshots to help explain your problem.

Device information (Server)

• Tachidesk version: (Example: v0.2.3-r255-win32)
• Server Operating System: (Example: Ubuntu 20.04)
• Server Desktop Environment: N/A or (Example: Gnome 40)
• Server JVM version: bundled with win32 or (Example: Java 8 Update 281 or OpenJDK 8u281)

  Device information (Client)

• Client version: (Example: 0.1.1)
• Client Type: (Example: Web, Android, Linux, Windows.)
• Client Operating System: (Example: Ubuntu 20.04)
• Client Specifications: (Example: Pixel 4a)
• (If the Client type is web) Client Web Browser: (Example: Google Chrome 89.0.4389.82)

Additional context Add any other context about the problem here.

[DattatreyaReddy]

it is fixed for now in the recent Server preview, where you can config your custom repo. (Check our discord)

You cannot config from Sorayomi for now. (Will add this in near future)