docs: update contribution release guide

[rickstaa]

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✅ Result of Pytest Coverage

---------- coverage: platform linux, python 3.8.16-final-0 -----------

Name	Stmts	Miss	Cover
stable_gym/init.py	8	0	100%
stable_gym/common/init.py	1	0	100%
stable_gym/common/disturbances.py	15	10	33%
stable_gym/common/disturber.py	383	337	12%
stable_gym/common/utils.py	95	82	14%
stable_gym/envs/init.py	0	0	100%
stable_gym/envs/biological/init.py	1	0	100%
stable_gym/envs/biological/oscillator/init.py	1	0	100%
stable_gym/envs/biological/oscillator/oscillator.py	131	34	74%
stable_gym/envs/biological/oscillator/oscillator_disturber.py	9	2	78%
stable_gym/envs/classic_control/init.py	2	0	100%
stable_gym/envs/classic_control/cartpole_cost/init.py	1	0	100%
stable_gym/envs/classic_control/cartpole_cost/cartpole_cost.py	245	125	49%
stable_gym/envs/classic_control/cartpole_cost/cartpole_cost_disturber.py	10	2	80%
stable_gym/envs/classic_control/ex3_ekf/init.py	1	0	100%
stable_gym/envs/classic_control/ex3_ekf/ex3_ekf.py	105	68	35%
stable_gym/envs/classic_control/ex3_ekf/ex3_ekf_disturber.py	10	2	80%
stable_gym/version.py	2	0	100%
tests/test_cart_pole.py	26	0	100%
tests/test_envs_register.py	7	0	100%
tests/test_oscillator.py	20	0	100%
TOTAL	1073	662	38%
Coverage	HTML	written	to
---------------------------	snapshot	report	summary
=========================	7	passed,	1