Adding docs for creating virtual icechunk references

I am currently working with the ODD team to prototype virtual icechunk store generation, and would like to document necessary steps and instructions as part of the VEDA docs.

For starters I have drafted a little doc that explains how to use role based access to deploy cloud infrastructure (here a lambda function) from a user account (this could be set up on the veda hub or locally).

I think that I would try to emulate the structure of the Kerchunk Reference Section and add the instructions how to deploy at the end.

Would love to hear some feedback if people think that would make sense in terms of structure? I would then make a WIP PR and keep adding to that as my project progresses.

cc @maxrjones