refactor: replace u32::max_value() with u32::MAX

[va-an]

Description

• use MAX instead of max_value() for numeric types
• update repo url for CONTRIBUTING.md

Applicable issues

• fixes refactor: replace u32::max_value() with u32::MAX #3682
• complements docs: add correct repo for cloning instructions #4494

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[jcnelson]

Thanks @va-an!

[codecov]

Codecov Report

Attention: Patch coverage is 41.89189% with 43 lines in your changes are missing coverage. Please review.

Project coverage is 81.21%. Comparing base (2c2afbc) to head (b3a5071).
Report is 5 commits behind head on develop.

Files	Patch %	Lines
testnet/stacks-node/src/tests/epoch_21.rs	0.00%	17 Missing ⚠️
testnet/stacks-node/src/tests/epoch_22.rs	0.00%	8 Missing ⚠️
testnet/stacks-node/src/tests/epoch_24.rs	0.00%	8 Missing ⚠️
testnet/stacks-node/src/tests/epoch_23.rs	0.00%	4 Missing ⚠️
testnet/stacks-node/src/tests/neon_integrations.rs	86.66%	4 Missing ⚠️
testnet/stacks-node/src/tests/epoch_205.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4529      +/-   ##
===========================================
- Coverage    82.33%   81.21%   -1.13%     
===========================================
  Files          404      404              
  Lines       292642   293057     +415     
===========================================
- Hits        240958   238009    -2949     
- Misses       51684    55048    +3364     

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[va-an]

Thanks for merging, @obycode !
Сan we close #3682 now? Or this it something like reminder-ticket?