Investigate replacing Redis with an alternative

[sambles]

Issue Description

Redis is used as a backed for the web-socket via Django-channels, look at alternatives for switching this to something else (if possible)

Reasons:

• Redis move from 'Open Source' to 'Source Available'
• The high costs (and slow deployment time) of redis via Azure Cache

[sambles]

https://stackoverflow.com/questions/53271407/channels-without-channel-layer-or-any-other-free-hosting https://channels.readthedocs.io/en/latest/topics/channel_layers.html