Add API field and integration config entry for WebsiteLogoUrl (#721)

This PR resolves #237. Very basic API implementation, doesn't default to
anything currently. Let me know if it should.

Author: jvyden

Refresh.GameServer/Configuration/IntegrationConfig.cs

@@ -7,7 +7,7 @@ namespace Refresh.GameServer.Configuration;
 /// </summary>
 public class IntegrationConfig : Config
 {
-    public override int CurrentConfigVersion => 6;
+    public override int CurrentConfigVersion => 7;
     public override int Version { get; set; }
     protected override void Migrate(int oldVer, dynamic oldConfig)
     {
@@ -69,4 +69,6 @@ protected override void Migrate(int oldVer, dynamic oldConfig)
     #endregion
 
     public string? GrafanaDashboardUrl { get; set; }
+
+    public string WebsiteLogoUrl { get; set; } = "https://github.com/LittleBigRefresh/Branding/blob/main/icons/refresh_transparent.svg";
 }

Refresh.GameServer/Endpoints/ApiV3/DataTypes/Response/ApiInstanceResponse.cs

@@ -48,6 +48,8 @@ public class ApiInstanceResponse : IApiResponse
     public required bool MaintenanceModeEnabled { get; set; }
     public required string? GrafanaDashboardUrl { get; set; }
 
+    public required string WebsiteLogoUrl { get; set; }
+    
     public required ApiContactInfoResponse ContactInfo { get; set; }
 
     public required ApiContestResponse? ActiveContest { get; set; }

Refresh.GameServer/Endpoints/ApiV3/InstanceApiEndpoints.cs

@@ -66,6 +66,7 @@ public ApiResponse<ApiInstanceResponse> GetInstanceInformation(RequestContext co
                 gameConfig,
                 richConfig), dataContext)!,
             GrafanaDashboardUrl = integrationConfig.GrafanaDashboardUrl,
+            WebsiteLogoUrl = integrationConfig.WebsiteLogoUrl,
 
             ContactInfo = new ApiContactInfoResponse
             {