Update java security whitelist to allow access to /assets and /icons

Author: dariuszwisniewski

src/main/java/info/fingo/urlopia/config/authentication/SecurityConfig.java

@@ -21,7 +21,7 @@
 public class SecurityConfig extends WebSecurityConfigurerAdapter {
 
     private static final String[] PUBLIC_ROUTES = {
-            "/", "/static/**", "/health/**", "/api/v2/info/**", "/api/v2/slack/**",
+            "/", "/assets/**", "/icons/**", "/health/**", "/api/v2/info/**", "/api/v2/slack/**",
             "/api/v2/proxy/**", "/login_check/**", "/icons/**", "/error", "/index.html"
     };
     private static final String[] ALLOWED_EXTENSIONS = {