Remove unused Emojis class/cpp file

src/emojis.hpp

@@ -4,7 +4,6 @@
 #include "messages/lazyloadedimage.hpp"
 
 #include <QObject>
-#include <QRegularExpression>
 #include <QString>
 
 #include <unordered_map>
@@ -21,13 +20,4 @@ struct EmojiData {
     QString shortCode;
 };
 
-class Emojis
-{
-public:
-    static QString replaceShortCodes(const QString &text);
-
-private:
-    static QRegularExpression findShortCodesRegex;
-};
-
 }  // namespace chatterino