credits: remove outdated contributor link and repos (#13776)

[ti-chi-bot]

This is an automated cherry-pick of #13776

What is changed, added or deleted? (Required)

• Remove an outdated link of contributors, which does not work now
• Update the list of repos because multiple repos have been combined or migrated to another repo
  • Note: All the changed will be cherry picked to v6.5, v6.6, v7.0 according to the repo archive date, while the change of removing the outdated contributor link will be cherry picked to all selected versions. The docs-dm repo link will be kept for v5.3 and earlier versions.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v7.1 (TiDB 7.1 versions)
• v7.0 (TiDB 7.0 versions)
• v6.6 (TiDB 6.6 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):
  • README: prepare to archive project dm dm#2276, https://docs.pingcap.com/zh/tidb-data-migration/v5.3
  • readme: move this repo to tidb br#1421
  • README: display a notice that the repository has been moved tidb-lightning#571
  • *: Dumpling merged into TiDB dumpling#379
  • README.md: mention this repo has been moved to pingcap/tidb parser#1372

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lilin90

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[lilin90]

LGTM

[lilin90]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 5ebc53f