[Doc] Update doc with new refactor update (#1)

* update latest changes

* fix pre commit

* update installation; seperate simulation and dataset install; fix dataset prepare in tran_eval

* improve details, fix install model, simulation add description, add video demo

* fix installation introduction, move data prepareation into one file

* fix typo, fix all scripts

* fix typos in simulation.md and train_eval.md

* update comments; fix typos and env content

* update title

* add internnav in title

Author: kew6688

source/en/_static/image/internnav_process.png

@@ -13,7 +13,7 @@ myst:
 :maxdepth: 2
 
 installation
+simulation
+interndata
 train_eval
-vln_evaluation
-create_model
 ```