Add f28/py3 notes for standalone deployment

Adds some notes to standalone deployment docs for fedora 28.
Part of ci-squad task at [1]

[1] https://tree.taiga.io/project/tripleo-ci-board/task/708

Change-Id: I0942dd73d13c24b8e53435ed6c75db8d2f0cabf2

_custom/custom.css

@@ -63,6 +63,7 @@
 }
 
 /* tags */
+.fedora28 {background: #aee;}
 .rhel {background: #fee;}
 .portal {background-color: #ded;}
 .satellite {background-color: #dee;}

doc/source/install/containers_deployment/standalone.rst

@@ -89,6 +89,25 @@ Deploying a Standalone OpenStack node
 #. Configure basic standalone parameters which include network configuration
    and some deployment options.
 
+   .. warning::
+      The standalone deployment requires one network interface on the deployment
+      machine  and **that interface will be reconfigured as per the parameters
+      you specify below**. The interface you want to use is specified by name
+      in the $INTERFACE parameter below and passed as the NeutronPublicInterface
+      in the standalone_parameters.yaml. If you only have one interface on your
+      machine be advised that it will be reconfigured to have the IP address
+      specified in $IP. If that is a remote box you may lose connectivity to it.
+      Any other network interfaces are left untouched.
+
+   For the standalone deployment we use a single NIC on the target machine
+   which is reconfigured and set as a member of an ovs bridge, **br-ctlplane**. Two
+   examples follow which can be copy/pasted as is - depending on your setup.
+   You should only have to change the name of the interface to match whatever
+   it is called on your system. Ideally you will have two network interfaces,
+   so that one is used for the standalone deployment, whilst the other will be
+   left untouched. This can be especially important if you are deploying on a
+   remote box (e.g. via ssh).
+
    The following configuration can be used for a system with 2 network
    interfaces. This configuration assumes the first interface is used for
    management and we will only configure the second interface. The deployment

doc/source/install/repositories.txt

@@ -1,5 +1,18 @@
 .. This should be changed to something more user-friendly like http://tripleo.org/tripleo-repos.rpm
 
+.. warning::
+   Support for Python3 is still experimental. The Fedora 28 specific notes
+   and commands appearing below should not be taken as indication that this
+   is fully supported by TripleO - we're still working on it!
+
+.. admonition:: Fedora 28
+   :class: fedora28
+
+   For Fedora 28 you will need to download the python3-tripleo-repos from
+   https://trunk.rdoproject.org/fedora/current/::
+
+       sudo yum install -y https://trunk.rdoproject.org/fedora/current/python3-tripleo-repos-<version>.fc28.noarch.rpm
+
 Download and install the python2-tripleo-repos RPM from
 `the current RDO repository <https://trunk.rdoproject.org/centos7/current/>`_.
 For example
@@ -93,6 +106,23 @@ For example
 
            sudo -E tripleo-repos -b rocky current ceph
 
+  .. admonition:: Fedora 28
+     :class: fedora28
+
+     Enable the current Fedora 28 repositories
+
+     .. code-block:: bash
+
+         sudo -E tripleo-repos -d fedora current
+
+     .. admonition:: Ceph
+        :class: ceph
+
+        Include the Ceph repo in the tripleo-repos call
+
+        .. code-block:: bash
+
+         sudo -E tripleo-repos -d fedora current ceph
 
 .. warning::