Remove the "Other Web Frameworks" documentation

Closes spring-projectsgh-36086

Author: sdeleuze

framework-docs/modules/ROOT/nav.adoc

@@ -261,7 +261,6 @@
 **** xref:web/websocket/stomp/configuration-performance.adoc[]
 **** xref:web/websocket/stomp/stats.adoc[]
 **** xref:web/websocket/stomp/testing.adoc[]
-** xref:web/integration.adoc[]
 * xref:web-reactive.adoc[]
 ** xref:web/webflux.adoc[]
 *** xref:web/webflux/new-framework.adoc[]