[DOC] Restruct and Simplify the Docs

[KenelmQLH]

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Description

The oneline docs url : https://qlh-edunlp.readthedocs.io/en/dev_docs/tutorial/zh/index.html

1. Restruct and rename some files

   Especially clear the definition of sif 、seg 、 tokenize 、 tokenization、vectorization

2. Simplify some Examples.
3. Rectify some Examples.
4. New Examples to add.

What does this implement/fix? Explain your changes.

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Pull request type

• [ ] [DATASET] Add a new dataset
• [ ] [BUGFIX] Bugfix
• [ ] [FEATURE] New feature (non-breaking change which adds functionality)
• [ ] [BREAKING] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] [STYLE] Code style update (formatting, renaming)
• [ ] [REFACTOR] Refactoring (no functional changes, no api changes)
• [ ] [BUILD] Build related changes
• [x] [DOC] Documentation content changes
• [ ] [OTHER] Other (please describe):

Changes

Does this close any currently open issues?

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Any relevant logs, error output, etc?

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Checklist

Before you submit a pull request, please make sure you have to following:

Essentials

• [x] PR's title starts with a category (e.g. [BUGFIX], [FEATURE], [BREAKING], [DOC], etc)
• [x] Changes are complete (i.e. I finished coding on this PR)
• [x] All changes have test coverage and al tests passing
• [x] Code is well-documented (extended the README / documentation, if necessary)
• [x] If this PR is your first one, add your name and github account to AUTHORS.md

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

[codecov-commenter]

Codecov Report

Merging #117 (be0e671) into dev (31335a0) will decrease coverage by 0.21%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #117      +/-   ##
==========================================
- Coverage   98.18%   97.96%   -0.22%     
==========================================
  Files          66       66              
  Lines        3245     3245              
==========================================
- Hits         3186     3179       -7     
- Misses         59       66       +7     

Impacted Files	Coverage Δ
EduNLP/Formula/Formula.py	100.00% <ø> (ø)
EduNLP/I2V/i2v.py	93.66% <ø> (-4.93%)	:arrow_down:
EduNLP/Pretrain/bert_vec.py	100.00% <ø> (ø)
EduNLP/Pretrain/disenqnet_vec.py	100.00% <ø> (ø)
EduNLP/Pretrain/gensim_vec.py	100.00% <ø> (ø)
EduNLP/SIF/segment/segment.py	100.00% <ø> (ø)
EduNLP/SIF/tokenization/tokenization.py	100.00% <ø> (ø)
EduNLP/Tokenizer/tokenizer.py	100.00% <ø> (ø)
EduNLP/Vector/t2v.py	100.00% <ø> (ø)

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