tweaks on prereq installation

docs/installation_instructions.rst

@@ -46,25 +46,22 @@ bare metal server ready. The server should meet these requirements:
 -  At least 25GB of disk space for installation, plus more for
    application data. We recommend starting with 30GB.
 -  Root ssh access
--  ``python3`` installed. On a debian based system:
-
-   ``apt install python3``
+-  ``python3`` installed (``apt install python3``)
 
 You should also have a trusted machine to run the installer on (we call this the
 ``provisioning machine``). All the commands listed in these instructions should
 be run on the provisioning machine, unless specified otherwise:
 
 - You need Python 3 with its development files, Pip and Git installed
-  (``apt install python3-pip python3-dev git``)
+  (``apt install python3-pip python3-dev git`` on Debian)
+- ``ssh-agent`` to give you access to your VPS
+- ``kubectl`` (`installation instructions <https://kubernetes.io/docs/tasks/tools/#kubectl>`__)
+- ``flux`` (`installation instructions <https://fluxcd.io/docs/installation/#install-the-flux-cli>`__)
 - We recommend using a `python
   virtualenv <https://docs.python.org/3/tutorial/venv.html>`__ to make
   sure we do not change any of your other projects. Install virtualenv
   by running ``pip3 install --user venv`` or
   ``apt install python3-venv``
-- ``ssh-agent`` to give you access to your VPS
-- ``kubectl``, installable with ``snap install kubectl``
-- ``flux``, follow the `flux documentation
-  <https://fluxcd.io/docs/installation/#install-the-flux-cli>`__
 
 Getting the installation script
 -------------------------------