updated link for the community edition of docker
MODIFY
docs/source/install.rst
docs/source/install.rst
@@ -11,7 +11,7 @@ Prerequisite: Docker
Install `Docker <https://www.docker.com>`_ as it is required
to build Docker images. The
-`Community Edition <https://www.docker.com/community-edition>`_,
+`Community Edition <https://docs.docker.com/install/>`_,
is available for free.
Recent versions of Docker are recommended.

updated link for the community edition of docker