fix links to sample app

[marcusholl]

The links provided in the docu does not work.

Maybe it would be a good idea so share credentials for accessing the demo-app.

When using the current links we get something like:

url: http://localhost:8080/browse/index.html

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Fri Oct 09 09:01:27 CEST 2026
There was an unexpected error (type=Not Found, status=404).
No static resource browse/index.html.
org.springframework.web.servlet.resource.NoResourceFoundException: No static resource browse/index.html for request '/browse/index.html'.
	at org.springframework.web.servlet.resource.ResourceHttpRequestHandler.handleRequest(ResourceHttpRequestHandler.java:527)
	at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:50)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:866)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1000)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:892)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:622)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:874)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108)
	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$2(FilterChainProxy.java:235)
	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:491)
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:353)
	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:84)
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:131)
	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101)
...