Update Bootswatch theme to 5.3.5 and add new theme(Brite) from Bootswatch (#1215)

(cherry picked from commit 638036d)

Author: r1gm

bootstrap-themes/src/main/java/de/agilecoders/wicket/themes/markup/html/bootswatch/BootswatchTheme.java

@@ -23,7 +23,7 @@
  * @author miha
  */
 public enum BootswatchTheme implements ITheme {
-    Cerulean, Cosmo, Cyborg, Darkly, Flatly, Journal, Litera, Lumen, Lux, Materia,
+    Brite, Cerulean, Cosmo, Cyborg, Darkly, Flatly, Journal, Litera, Lumen, Lux, Materia,
     Minty, Morph, Pulse, Quartz, Sandstone, Simplex, Sketchy, Slate, Solar, Spacelab,
     Superhero, United, Vapor, Yeti, Zephyr;