Update old homepage residual refs and non working git protocol

docs/changelog

@@ -4,6 +4,9 @@ Changelog
 next:
 	* Documentation: Add 'Perils of CDIST_ORDER_DEPENDENCY' sub-section (Darko Poljak)
 	* Build: Clean and separate end user targets into Makefile and maintainer targets into build-helper (Darko Poljak)
+	* Core: Update residual references to old cdist homepage (Darko Poljak)
+	* Documentation: Update residual references to old cdist homepage and git source (Darko Poljak)
+	* Type __cdist: Fix non working 'git://' protocol source (Darko Poljak)
 
 5.0.0: 2019-05-05
 	* Type __zypper_service: Fix spelling error in manpage (Dmitry Bogatov)

docs/src/cdist-install.rst

@@ -43,6 +43,8 @@ To install cdist, execute the following commands:
 From version 4.2.0 cdist tags and releases are signed.
 You can get GPG public key used for signing `here <_static/pgp-key-EFD2AE4EC36B6901.asc>`_.
 
+You can also get cdist from `github mirror <https://github.com/ungleich/cdist>`_.
+
 To install cdist with distutils from cloned repository, first you have to
 create version.py:
 

docs/src/cdist-quickstart.rst

@@ -54,9 +54,7 @@ we can use cdist to configure it. You can copy and paste the following
 code into your shell to get started and configure localhost::
 
     # Get cdist 
-    # Mirrors can be found on
-    # http://www.nico.schottelius.org/software/cdist/install/#index2h4
-    git clone git://code.ungleich.ch/ungleich-public/cdist
+    git clone git@code.ungleich.ch:ungleich-public/cdist.git
 
     # Create manifest (maps configuration to host(s)
     cd cdist