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/web.config

@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-  <location path="." inheritInChildApplications="false">
-    <system.webServer>
-      <handlers>
-        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
-      </handlers>
-      <aspNetCore processPath="dotnet" arguments=".\jellyfin.dll" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" hostingModel="inprocess" />
-    </system.webServer>
-  </location>
-</configuration>
-<!--ProjectGuid: 07E39F42-A2C6-4B32-AF8C-725F957A73FF-->