remove unused observation and prediction files

Closes #2 (closed)

RLLib_training/experiment_configs/config_example/config.gin

-run_experiment.name = "experiment_example"
-run_experiment.num_iterations = 1002
-run_experiment.save_every = 100
-run_experiment.hidden_sizes = [32, 32]
-
-run_experiment.map_width = 20
-run_experiment.map_height = 20
-run_experiment.n_agents = {"grid_search": [3, 4, 5, 6, 7, 8]}
-run_experiment.rail_generator = "complex_rail_generator" # Change this to "load_env" in order to load a predefined complex scene
-run_experiment.nr_extra = 5
-run_experiment.policy_folder_name = "ppo_policy_two_obs_with_predictions_n_agents_{config[n_agents]}_"
-
-run_experiment.seed = 123
-
-run_experiment.conv_model = False
-
-run_experiment.obs_builder = @TreeObsForRailEnv()
-TreeObsForRailEnv.predictor = @ShortestPathPredictorForRailEnv()
-TreeObsForRailEnv.max_depth = 2
-
-run_experiment.entropy_coeff = 0.001
-run_experiment.kl_coeff = 0.2 
-run_experiment.lambda_gae = 0.9
-run_experiment.step_memory = 2
-run_experiment.min_dist = 10