lightning: align error resolution; delete migrate-from-csv

[ran-huang]

What is changed, added or deleted? (Required)

• Delete tidb-lightning/migrate-from-csv-using-tidb-lightning.md
• Align tidb-lightning/tidb-lightning-error-resolution.md
• Align TOC

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.

• [x] master (the latest development version)
• [ ] v6.4 (TiDB 6.4 versions)
• [x] v6.3 (TiDB 6.3 versions)
• [x] 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: https://github.com/pingcap/docs-cn/pull/9653, https://github.com/pingcap/docs-cn/pull/10416
• Other reference link(s):

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qiancai

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[ti-chi-bot]

@ran-huang: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[qiancai]

Removed the needs-cherry-pick-release-6.3 label because the v6.3 docs have been archived at https://docs-archive.pingcap.com/tidb/v6.3 and will no longer receive new updates.

[qiancai]

Removed the needs-cherry-pick-release-6.4 label because the v6.4 docs have been archived at https://docs-archive.pingcap.com/tidb/v6.4 and will no longer receive new updates.

[ran-huang]

/rebase

[ran-huang]

/merge

[ti-chi-bot[bot]]

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

Commit hash: 4c51e737d73d43898ba861ee98f185c92de8b62c

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.6: #13435.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.0: #13436.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #13437.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #13438.