Drop support for rendering views from the HtmxHandlerInterceptor

This was introduced by wimdeblauwe#128, but a HandlerInterceptor should never be responsible for rendering views.

htmx-spring-boot/src/main/java/io/github/wimdeblauwe/htmx/spring/boot/mvc/HtmxHandlerInterceptor.java

@@ -40,10 +40,7 @@ public void postHandle(HttpServletRequest request, HttpServletResponse response,
     }
 
     private void buildAndRender(HtmxResponse htmxResponse, ModelAndView mav, HttpServletRequest request, HttpServletResponse response) {
-        View v = htmxResponseHandlerMethodReturnValueHandler.toView(htmxResponse);
         try {
-            Map<String, Object> model = mav != null ? mav.getModel() : Map.of();
-            v.render(model, request, response);
             // ModelAndViewContainer is not available here, so flash attributes won't work
             htmxResponseHandlerMethodReturnValueHandler.addHxHeaders(htmxResponse, request, response, null);
         } catch (Exception e) {