Create documentation for demo environment configs

[ieaves]

Various docker deployment configs can be found in the examples folder alongside the cli command grai demo start. However these are largely undocumented. We should include more details in the various doc pages including

• a copy of the docker scripts
• A page about the cli demo commands

[Vasanthavel124]

can you assign me this?

[ieaves]

@Vasanthavel124 done!

[ieaves]

Hey @Vasanthavel124 just a quick checkin. Are you still working on this or should I unassign it?