LibWeb: Add HTML copyright escape

Author: https://github.com/FalseHonesty
Commit: 4e8bcda4d1
Pull-request: https://github.com/SerenityOS/serenity/pull/2406

Libraries/LibWeb/Parser/HTMLParser.cpp

@@ -229,6 +229,7 @@ static bool parse_html_document(const StringView& html, Document& document, Pare
                     { """, "\"" },
                     { "»", ">>" },
                     { "&laquo;", "<<" },
+                    { "&copy;", "\xC2\xA9" },
                 };
                 auto rest_of_html = html.substring_view(i, html.length() - i);
                 bool found = false;