reorg and update docs.

[yecol]

as titled.

[github-actions]

🎊 PR Preview f1dd3a1 has been successfully built and deployed to https://alibaba-graphscope-build-pr-2473.surge.sh

_{🤖 By surge-preview}

[codecov-commenter]

Codecov Report

Merging #2473 (7fb6aa3) into main (e9850d3) will decrease coverage by 33.27%.
The diff coverage is n/a.

❗ Current head 7fb6aa3 differs from pull request most recent head f1dd3a1. Consider uploading reports for the commit f1dd3a1 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2473       +/-   ##
===========================================
- Coverage   73.22%   39.95%   -33.27%     
===========================================
  Files          88       88               
  Lines        9769     9769               
===========================================
- Hits         7153     3903     -3250     
- Misses       2616     5866     +3250     

Impacted Files	Coverage Δ
python/graphscope/tests/unittest/test_java_app.py	0.00% <0.00%> (-100.00%)	⬇️
...ython/graphscope/tests/unittest/test_cython_ast.py	0.00% <0.00%> (-100.00%)	⬇️
...ython/graphscope/tests/unittest/test_serailaize.py	0.00% <0.00%> (-100.00%)	⬇️
python/graphscope/analytical/udf/patch.py	3.47% <0.00%> (-96.53%)	⬇️
python/graphscope/tests/unittest/test_app.py	0.00% <0.00%> (-96.32%)	⬇️
python/graphscope/tests/unittest/test_lazy.py	0.00% <0.00%> (-96.22%)	⬇️
...thon/graphscope/tests/unittest/test_scalability.py	0.00% <0.00%> (-96.16%)	⬇️
...hon/graphscope/tests/unittest/test_create_graph.py	0.00% <0.00%> (-92.89%)	⬇️
python/graphscope/tests/unittest/test_graph.py	0.00% <0.00%> (-85.92%)	⬇️
python/graphscope/tests/unittest/test_context.py	0.00% <0.00%> (-81.36%)	⬇️
... and 37 more

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