fix(v2): do not process anchor links by router

[lex111]

Motivation

Resolve #2552

Anchor links that refer to sections in the current file should not be processed by the router, because otherwise the current URL is added to them ("/docs/docs/#doc" instead of just "#doc"), and this breaks them (in case of non-ASCII characters).

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

In any MD document, define new heading using non-ASCII characters. And then try to refer to
this section through a new link.

The example below uses Russian characters, for example, but you can use Persian, as indicated in #2552

...

# Тест

...

[Тест](#тест)

Related PRs

(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)

[docusaurus-bot]

Deploy preview for docusaurus-2 ready!

Built with commit 95acb6f

https://deploy-preview-2580--docusaurus-2.netlify.com

[lex111]

@yangshun I wonder why we use NavLink instead of regular Link component for Docusaurus/Link component? This is rather strange, considering that NavLink is needed only in NavBar and Footer components, and in regular (or user-land) links, the functionality inherent in NavLink is not needed.

From docs:

A special version of the that will add styling attributes to the rendered element when it matches the current URL.

docusaurus/packages/docusaurus/src/client/exports/Link.js

Line 75 in 95acb6f

<NavLink

As a result, all internal links have extra attributes (aria-current="page" class="active"):

... <a aria-current="page" class="active" href="/docs/docs/#sidebar-item">sidebar item</a>

... <a aria-current="page" class="active" href="/docs/cli">here</a>

In the case of anchors links now this will not happen (but still relevant for other internal links, this is an unnecessary job that makes the router).

I suggest replacing it with Link component, any objections against this?

[yangshun]

I suggest replacing it with Link component, any objections against this?

Yep, I think this makes sense.