Move mongoose docs to https://cesanta.com/docs/

PUBLISHED_FROM=ebf5568abe82952ab2751298185a10189098013f

docs/overview/intro.md

@@ -1,15 +1,4 @@
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-title: Overview
-items:
-#  - { name: usage-example.md }
-  - { name: concept.md }
-  - { name: mbufs.md }
-  - { name: event-handler.md }
-  - { name: events.md }
-  - { name: conn-flags.md }
-  - { name: build-options }
-  - { name: usage-example.md }
----
+# Introduction
 
 Mongoose is a networking library written in C.
 It is a swiss army knife for embedded network programming.