Document TensoRF Under the "Methods" page on the docs site

[UPstartDeveloper]

Is your feature request related to a problem? Please describe. I would like to know how training with TensoRF in this library differs from the original repo that the authors created.

Describe the solution you'd like A clear and concise description of TensoRF (including theory + usage details) on https://docs.nerf.studio/en/latest/nerfology/methods/index.html

Additional context I'd be able to support on this! I did a 6-month internship on NeRF after my undergrad, TensoRF is one of the papers I think I learned a lot about, since we spent hours studying it from both a math+code perspective.