feat: rewriting cancellation and timeouts page (#4585)

* feat: rewriting cancellation and timeouts page

* update: implementing additional review comments from Natasha

* update: implementing TWr review comments

* fix: link chage

* update: changed navigation

* update: slightly rewording NonCancellable note

Author: daniCsorbaJB

docs/kc.tree

@@ -5,7 +5,7 @@
 		<toc-element topic="coroutines-guide.md"/>
 		<toc-element accepts-web-file-names="basics.html,coroutines-basic-jvm.html" topic="coroutines-basics.md"/>
 		<toc-element topic="coroutines-and-channels.md"/>
-		<toc-element topic="cancellation-and-timeouts.md"/>
+		<toc-element topic="cancellation-and-timeouts.md" toc-title="Cancellation"/>
 		<toc-element topic="composing-suspending-functions.md"/>
 		<toc-element topic="coroutine-context-and-dispatchers.md"/>
 		<toc-element topic="flow.md"/>