update: update docs for the new WebHelp engine (#2393)

* update: update cancellation-and-timeouts.md
* update: update channels.md
* update: update composing-suspending-functions.md
* update: update coroutine-context-and-dispatchers.md
* update: update coroutines-guide.md
* update: update exception-handling.md
* update: update select-expression.md
* update: update shared-mutable-state-and-concurrency.md
* update: update basics.md
* update: update flow.md
* update: update flow.md
* update: update _nav.yml
* update: add _nav.tree
* update: update links
* update: fixes after review
* update: get rid of divs
* update: add new lines for WebHelp parser
* update: add new lines for WebHelp parser
* fix: fix knit errors
* removed _nav.yml;
* renamed _nav.tree to kc.tree.
*  removed coroutines overview from the list; a title for a hands-on tutorial
* update: Made kc.tree as valid XML
* update: added a configuration file project.ihp
* update: added a configuration file buildprofiles.xml
* update: moved coroutines overview from the main repository
* update: update cancellation-and-timeouts.md
* update: update channels.md
* update: update composing-suspending-functions.md
* update: update coroutine-context-and-dispatchers.md
* update: update coroutines-guide.md
* update: update exception-handling.md
* update: update select-expression.md
* update: update shared-mutable-state-and-concurrency.md
* update: update basics.md
* update: update flow.md
* update: update flow.md
* update: update _nav.yml
* update: add _nav.tree
* update: update links
* update: fixes after review
* update: get rid of divs
* removed _nav.yml;
* renamed _nav.tree to kc.tree.
* removed coroutines overview from the list; a title for a hands-on tutorial
* update: Made kc.tree as valid XML
* update: added a configuration file project.ihp
* update: added a configuration file buildprofiles.xml
* update: moved coroutines overview from the main repository
* update: move debug tutorials to coroutines repository
* update: update after knit
* update: move all docs files to topics/
* update: corrected the xml version of project.ihp
* update: move old jvm tutorial coroutines-basic-jvm.md
* update: moved knit.properties to resolve relative path correctly
* update: add stubs for moved pages
* update: update README.md

Co-authored-by: Ekaterina.Volodko <ekaterina.volodko@jetbrains.com>
diff --git a/docs/project.ihp b/docs/project.ihp
new file mode 100644
index 0000000..80859c4
--- /dev/null
+++ b/docs/project.ihp
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE ihp SYSTEM "http://helpserver.labs.intellij.net/help/ihp.dtd">
+
+<ihp version="2.0">
+    <categories src="c.list"/>
+    <topics dir="topics"/>
+    <images dir="images" web-path="/img/kotlin-coroutines/"/>
+    <vars src="v.list"/>
+    <product version="%coroutinesVersion%" id="help/kotlin-coroutines" src="kc.tree" web-path="/kotlin-coroutines/"/>
+    <settings>
+        <default-property element-name="toc-element" property-name="show-structure-depth" value="2"/>
+    </settings>
+</ihp>
\ No newline at end of file