Fixed repository link for mx-puppet-steam

- https://github.com/icewind1991/mx-puppet-steam is the link that's referenced by the documentation.
- The previous link, https://github.com/matrix-steam/mx-puppet-steam, is invalid/inaccessible to the public.

roles/matrix-bridge-mx-puppet-steam/tasks/setup_install.yml

@@ -32,7 +32,7 @@
 
 - name: Ensure MX Puppet Steam repository is present on self build
   git:
-    repo: https://github.com/matrix-steam/mx-puppet-steam.git
+    repo: https://github.com/icewind1991/mx-puppet-steam.git
     dest: "{{ matrix_mx_puppet_steam_docker_src_files_path }}"
     force: "yes"
   when: "matrix_mx_puppet_steam_enabled|bool and matrix_mx_puppet_steam_container_image_self_build"