sudachi: Fix homepage, url and autoupdate

[limouren]

Move homepage, checkvar and autoupdate to sudachi new home https://sudachi.emuplace.app/

Closes #1213

• [x] I have read the Contributing Guide.

[github-actions[bot]]

All changes look good.

Wait for review from human collaborators.

sudachi

• [x] Description
• [x] License
• [x] Hashes
• [x] Checkver
• [x] Autoupdate

[limouren]

Thanks @Calinou, that's quick! m( )m