Use config.domain in place of hardcoded value

src/invidious/helpers/helpers.cr

@@ -15,7 +15,10 @@ class Config
     https_only:   Bool?,
     hmac_key:     String?,
     full_refresh: Bool,
-    domain:       String?,
+    domain:       {
+      type:    String?,
+      default: "invidio.us",
+    },
   })
 end
 

src/invidious/helpers/utils.cr

@@ -205,8 +205,6 @@ def make_host_url(ssl, host)
     scheme = "http://"
   end
 
-  host ||= "invidio.us"
-
   return "#{scheme}#{host}"
 end
 

src/invidious/videos.cr

@@ -137,7 +137,7 @@ BYPASS_REGIONS = {
 }
 
 VIDEO_THUMBNAILS = {
-  {name: "maxres", host: "invidio.us", url: "maxres", height: 720, width: 1280},
+  {name: "maxres", host: "#{CONFIG.domain}", url: "maxres", height: 720, width: 1280},
   {name: "maxresdefault", host: "i.ytimg.com", url: "maxresdefault", height: 720, width: 1280},
   {name: "sddefault", host: "i.ytimg.com", url: "sddefault", height: 480, width: 640},
   {name: "high", host: "i.ytimg.com", url: "hqdefault", height: 360, width: 480},