fead: add layout_index_webkit.ipynb & nbconvert==7.16.6，notebook==7.4.2，jupyter==1.1.1 & fix: pre commit achieved clear all output data of jupyter file

[renpengli01]

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Motivation

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Modification

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BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

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Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@            Coverage Diff             @@
##              dev     #420      +/-   ##
==========================================
- Coverage   89.97%   89.85%   -0.12%     
==========================================
  Files         107      111       +4     
  Lines        8288     8486     +198     
==========================================
+ Hits         7457     7625     +168     
- Misses        831      861      +30     

Files with missing lines	Coverage Δ
llm_web_kit/html_layout/html_layout_cosin.py	98.40% <100.00%> (+4.80%)	⬆️

... and 12 files with indirect coverage changes

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