docs: refactor documentation

[Benjamin-eecs]

Description

Describe your changes in detail.

Types of changes

• Documentation (update in the documentation)

Checklist

• I have read the CONTRIBUTION guide. (required)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have reformatted the code using make format. (required)
• I have checked the code using make lint. (required)
• I have ensured make test pass. (required)

[codecov-commenter]

Codecov Report

Base: 70.35% // Head: 69.52% // Decreases project coverage by -0.83% ⚠️

Coverage data is based on head (e3b1686) compared to base (2c0a0df).
Patch has no changes to coverable lines.

❗ Current head e3b1686 differs from pull request most recent head c048570. Consider uploading reports for the commit c048570 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
- Coverage   70.35%   69.52%   -0.83%     
==========================================
  Files          72       69       -3     
  Lines        3009     2901     -108     
==========================================
- Hits         2117     2017     -100     
+ Misses        892      884       -8     

Flag	Coverage Δ
unittests	69.52% <ø> (-0.83%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
torchopt/diff/zero_order/__init__.py	90.90% <0.00%> (-9.10%)	⬇️
torchopt/accelerated_op/adam_op.py	71.42% <0.00%> (-3.26%)	⬇️
torchopt/diff/zero_order/decorator.py	95.00% <0.00%> (-1.95%)	⬇️
torchopt/distributed/world.py	52.74% <0.00%> (-1.02%)	⬇️
torchopt/base.py	76.92% <0.00%> (-0.69%)	⬇️
torchopt/nn/module.py	39.81% <0.00%> (-0.28%)	⬇️
torchopt/typing.py	95.45% <0.00%> (-0.20%)	⬇️
torchopt/diff/implicit/decorator.py	95.67% <0.00%> (-0.09%)	⬇️
torchopt/utils.py	56.85% <0.00%> (ø)
torchopt/alias/utils.py	92.85% <0.00%> (ø)
... and 11 more

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