Add proper user-friendly theme manager (#635)

Co-authored-by: Justice Almanzar <superdash993@gmail.com>
Co-authored-by: Nuckyz <61953774+Nuckyz@users.noreply.github.com>
Co-authored-by: V <vendicated@riseup.net>

src/main/utils/constants.ts

@@ -25,6 +25,7 @@ export const DATA_DIR = process.env.VENCORD_USER_DATA_DIR ?? (
         : join(app.getPath("userData"), "..", "Vencord")
 );
 export const SETTINGS_DIR = join(DATA_DIR, "settings");
+export const THEMES_DIR = join(DATA_DIR, "themes");
 export const QUICKCSS_PATH = join(SETTINGS_DIR, "quickCss.css");
 export const SETTINGS_FILE = join(SETTINGS_DIR, "settings.json");
 export const ALLOWED_PROTOCOLS = [