Release 0.4.0

[Lookatator]

This PR introduces:

• Feat: add DCG-MAP-Elites algorithm - #167
• Fix the Pareto Dominance definition - #174
• Doc: clarify contribution process - #171
• Feat: Upgrade Library Versions and Python Version - #187

Remaining To Dos:

• [x] Adding Test for DCG-MAP-Elites
• [x] Change name DCG-ME -> DCRL-ME
• [x] Adding Notebook for DCRL-ME
• [x] Adding link to doc for DCRL-ME

Checks

• (N/A) a clear description of the PR has been added
• (N/A) sufficient tests have been written
• (N/A) relevant section added to the documentation
• (N/A) example notebook added to the repo
• (N/A) clean docstrings and comments have been written
• (N/A) if any issue/observation has been discovered, a new issue has been opened

Future improvements

N/A

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 93.55609% with 54 lines in your changes missing coverage. Please review.

Project coverage is 92.26%. Comparing base (a721221) to head (0508d7c). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
qdax/environments/wrappers.py	41.17%	20 Missing :warning:
qdax/tasks/brax_envs.py	28.57%	15 Missing :warning:
qdax/core/neuroevolution/mdp_utils.py	44.44%	5 Missing :warning:
qdax/core/neuroevolution/networks/dads_networks.py	94.44%	3 Missing :warning:
qdax/utils/pareto_front.py	57.14%	3 Missing :warning:
qdax/core/emitters/dcrl_emitter.py	99.00%	2 Missing :warning:
qdax/core/emitters/mees_emitter.py	87.50%	2 Missing :warning:
qdax/core/containers/archive.py	66.66%	1 Missing :warning:
qdax/core/neuroevolution/networks/networks.py	97.77%	1 Missing :warning:
qdax/environments/exploration_wrappers.py	0.00%	1 Missing :warning:
... and 1 more

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #183 +/- ## ========================================== - Coverage 92.30% 92.26% -0.04% ========================================== Files 125 128 +3 Lines 7485 8007 +522 ========================================== + Hits 6909 7388 +479 - Misses 576 619 +43 ```

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