Remove legacy startup configuration files and web assets

- Deleted startup.json, startup.json.linux, and startup.json.windows files to streamline configuration management.
- Removed web.config file as part of the cleanup process.
- Deleted jellyfin.svg and its compressed versions from the API documentation.
- Removed custom CSS files for ReDoc and Swagger documentation, including their compressed versions.

publish/Resources/Configuration/startup.default.json

@@ -1,14 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/jellyfin-startup",
-  "// Comment": "Startup configuration defaults for Jellyfin Server",
-  "// Note": "For Linux: Use /var/lib/jellyfin, For Windows: Use C:/ProgramData/jellyfin",
-  "// Documentation": "These values are used when no command-line args or environment variables are set",
-  "Paths": {
-    "DataDir": "/var/lib/jellyfin",
-    "ConfigDir": "/var/lib/jellyfin",
-    "CacheDir": "/var/lib/jellyfin",
-    "LogDir": "/var/lib/jellyfin",
-    "TempDir": "/var/lib/jellyfin",
-    "WebDir": "/var/lib/jellyfin"
-  }
-}