refactor(Link): unify all the navigate and scroll behavior

[SoonIter]

Summary

1. unify all the navigate and scroll behavior logic into one

2. unify all <a /> to component, and comment that why we need to use <Link /> rather than <a />

Features related to scroll

1. inCurrentPage: toc click

toc.mp4

2. inCurrentPage: anchor click

anchor.mp4

3. inCurrentSite

currentsite.mp4

4. hashChange

hash.chagne.mp4

Related Issue

#1856

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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