Fix #3877: Add sta.sh strategy.

Co-authored-by: lllusion3469 <31420484+lllusion3469@users.noreply.github.com>

app/logical/sources/strategies/deviant_art.rb

@@ -198,15 +198,19 @@ module Sources
         self.class.artist_name_from_url(url) || self.class.artist_name_from_url(referer_url)
       end
 
-      def page
+      def api_url
         return nil if deviation_id.blank?
-        deviation_url = "https://www.deviantart.com/deviation/#{deviation_id}"
+        "https://www.deviantart.com/deviation/#{deviation_id}"
+      end
+
+      def page
+        return nil if api_url.blank?
 
         options = Danbooru.config.httparty_options.deep_merge(
           format: :plain, 
           headers: { "Accept-Encoding" => "gzip" }
         )
-        resp = HTTParty.get(deviation_url, **options)
+        resp = HTTParty.get(api_url, **options)
 
         if resp.success?
           body = Zlib.gunzip(resp.body)