Update and move connman proxy setup guide

The guide on connman proxy setup is relevant, update the formatting, add a
little more info on how to check current config and move to guides.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/docs/proxysetup.md

-+++
-date = "2014-12-10"
-weight = 100
-
-title = "Proxy Setup"
-
-aliases = [
-    "/old-wiki/Docs/ProxySetup"
-]
-+++
-
-# How to setup proxy connectivity using connman
-
-To setup a proxy using connman for proxy <http://127.0.0.1:3128/>:
-
-` connmanctl config `<service>` --proxy manual `<proxy url and port>
-
-  - Replace <service> with the service connman is connected to
-  - You can list services with connmanctl services:
-
-` # connmanctl services`
-` *AO Wired                ethernet_525400a6d228_cable`
-
-So in this case it would be:
-
-` connmanctl config ethernet_525400a6d228_cable --proxy manual `<http://127.0.0.1:3128/>

content/guides/connmanproxysetup.md

++++
+date = "2014-12-10"
+weight = 100
+
+title = "Connman Proxy Setup"
+
+aliases = [
+    "/old-wiki/Docs/ProxySetup"
+]
++++
+
+The proxy used by a specific interface can be configured for connman on the
+command line with:
+
+    connmanctl config <service> --proxy manual <proxy url and port>
+
+Where `<service>` is the name of the interface and `<proxy url and port>` is
+the proxy to be used.
+
+You can list services with `connmanctl services`:
+
+    $ connmanctl services
+    *AO Wired                ethernet_525400a6d228_cable
+
+So to set the wired ethernet interface from the example above to use a HTTP
+proxy on `127.0.0.1` at port `3128` this would be:
+
+    $ connmanctl config ethernet_525400a6d228_cable --proxy manual http://127.0.0.1:3128/
+
+The existing configuration can be seen with `connmanctl services <service>`.