add redirect for old icon image URLs
add redirect for old icon image URLs

kudustress/NuGetGallery2,KuduApps/NuGetGallery,JetBrains/ReSharperGallery,kudustress/NuGetGallery2,skbkontur/NuGetGallery,projectkudu/SiteExtensionGallery,ScottShingler/NuGetGallery,grenade/NuGetGallery_download-count-patch,JetBrains/ReSharperGallery,JetBrains/ReSharperGallery,grenade/NuGetGallery_download-count-patch,ScottShingler/NuGetGallery,KuduApps/NuGetGallery,projectkudu/SiteExtensionGallery,KuduApps/NugetGallery21Fx45-DeleteMe,kudustress/NuGetGallery,KuduApps/NugetGallery16Fx45-DeleteMe,KuduApps/NuGetGallery,KuduApps/NuGetGallery,ScottShingler/NuGetGallery,kudustress/NuGetGalleryOptmized,grenade/NuGetGallery_download-count-patch,kudustress/NuGetGalleryOptmized,mtian/SiteExtensionGallery,KuduApps/NuGetGallery,KuduApps/NugetGallery16Fx45-DeleteMe,kudustress/NuGetGallery,skbkontur/NuGetGallery,projectkudu/SiteExtensionGallery,mtian/SiteExtensionGallery,skbkontur/NuGetGallery,KuduApps/NugetGallery21Fx45-DeleteMe,mtian/SiteExtensionGallery