FIReVision User Guide Documentation setup

[andrewjong]

Create a readthedocs.io style documentation on the AirLab website, e.g. theairlab.org/wildfire/firevision/docs

• How the user can use our simulator

• how to run it

• how to work with AirSim

• how to get the thermal image and the RGB image

• how things are implemented

• adding more fires, adding more crew

[andrewjong]

I've added a live doc page to https://castacks.github.io/firevision_sim/

it can be edited by editing the restructured text (.rst) files here https://github.com/castacks/firevision_sim/tree/main/docs

can write the docs in Google Docs for now and I can help with transferring over to .rst format later