Rebuild docs to make them easier to maintain

_posts/2000-06-06-setKeepAlive.md

@@ -0,0 +1,20 @@
+---
+tag: api
+type: function
+name: setKeepAlive
+params:
+  - name: keepAlive
+    description: the keep alive interval, in seconds
+    type: uint16_t
+returns:
+  type: PubSubClient*
+  values:
+    - value: PubSubClient*
+      description: the client instance, allowing the function to be chained
+---
+
+Sets the keep alive interval used by the client. This value should only be changed
+when the client is not connected.
+
+By default, it is set to `15` seconds - as defined by the `MQTT_KEEPALIVE`
+constant in `PubSubClient.h`.