Remove outdated domains [skip ci]

Source/domainset/cdn.conf

@@ -508,7 +508,6 @@ res-geo.cdn.office.net
 static2.sharepointonline.com
 prod.msocdn.com
 spoprod-a.akamaihd.net
-spoppe-b.azureedge.net
 img-prod-cms-rt-microsoft-com.akamaized.net
 prod-streaming-video-msn-com.akamaized.net
 prod-video-cms-amp-microsoft-com.akamaized.net
@@ -844,7 +843,6 @@ img-cos.mandaoo.com
 img.mresou.com
 cdn.yinghuazy.xyz
 img.catwvod.xyz
-pic.libilibi.top
 pic.imge.cc
 .imagehub.cc
 img.kemono.su
@@ -3451,8 +3449,6 @@ assets.dwncdn.net
 .scribdassets.com
 cdn.reimu.net
 img.reimu.net
-useruploads.socratic.org
-static.socratic.org
 assets.vogue.com
 .surrit.com
 .sixyik.com