removed unusable tbx11k custom split 3

doc/api.rst

doc/config.rst

pyproject.toml

...ptbench/configs/datasets/tbx11k_simplified_v3/__init__.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/default.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/fold_0.py

...bench/configs/datasets/tbx11k_simplified_v3/fold_0_rgb.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/fold_1.py

...bench/configs/datasets/tbx11k_simplified_v3/fold_1_rgb.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/fold_2.py

...bench/configs/datasets/tbx11k_simplified_v3/fold_2_rgb.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/fold_3.py

...bench/configs/datasets/tbx11k_simplified_v3/fold_3_rgb.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/fold_4.py

...bench/configs/datasets/tbx11k_simplified_v3/fold_4_rgb.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/fold_5.py

...bench/configs/datasets/tbx11k_simplified_v3/fold_5_rgb.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/fold_6.py

...bench/configs/datasets/tbx11k_simplified_v3/fold_6_rgb.py

src/ptbench/configs/datasets/tbx11k_simplified_v3/fold_7.py