docs: update translation editor links

[JSap0914]

Summary

• replace the broken Inlang badge/editor links in the README translation section with the current Fink workspace URL
• remove the dead badge image because the Inlang badge endpoint now returns 404

Fixes #8849.

Source proof

• README.md linked to https://inlang.com/editor/github.com/AppFlowy-IO/AppFlowy?ref=badge and https://inlang.com/editor/github.com/AppFlowy-IO/AppFlowy.
• curl -sSIL returned 404 for the old editor URL and 404 for https://inlang.com/badge?url=github.com/AppFlowy-IO/AppFlowy.
• curl -sSIL returned 200 for https://fink.inlang.com/github.com/AppFlowy-IO/AppFlowy.

Verification

• curl -sSIL https://fink.inlang.com/github.com/AppFlowy-IO/AppFlowy?ref=badge -> 200
• curl -sSIL https://fink.inlang.com/github.com/AppFlowy-IO/AppFlowy -> 200
• rg -n "inlang.com/(badge|editor)|fink.inlang.com|Translations" README.md
• git diff --check

Summary by Sourcery

Documentation:

• Refresh README translation instructions and links to point to the Fink online editor and remove the obsolete Inlang badge link.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the translation-related links in README.md to point from deprecated Inlang resources to the current Fink workspace, and removes the broken badge image link.

Flow diagram for updated translation tooling links in README

flowchart LR
    Contributor[Contributor reads README Translations section]
    BadgeLink[Translate AppFlowy with Fink link]
    EditorLink[Fink online editor link]
    FinkWorkspace[Fink AppFlowy workspace]

    Contributor --> BadgeLink
    Contributor --> EditorLink
    BadgeLink --> FinkWorkspace
    EditorLink --> FinkWorkspace

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File-Level Changes

Change	Details	Files
Update README translation section to use Fink editor URLs instead of deprecated Inlang links and remove the broken translation badge.	Replace the Inlang badge markdown with a plain text link labeled "Translate AppFlowy with Fink" that points to the Fink workspace URL with the ref=badge parameter. Update the reference to the "inlang online editor" to instead reference the "Fink online editor" while keeping the surrounding translation instructions unchanged. Ensure all remaining Inlang-related references in the translation section now resolve to working Fink URLs.	README.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8849	Update the broken Inlang editor link in the README translation section to point to a working, current translation workspace or workflow.	✅
#8849	Remove or update the broken Inlang translation badge/link in the README that currently returns a 404 error.	✅

Possibly linked issues

• [Bug] docs: Broken Inlang translation link in README (404 Error) #8849: PR replaces the dead Inlang badge/editor links in README with working Fink translation workspace URLs.

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