Docs for v17 incremental backup and recovery

[shlomi-noach]

This PR adds (late) v17 documentation for incremental backups and recoveries, following these changes in v17:

• https://github.com/vitessio/vitess/pull/11097
• https://github.com/vitessio/vitess/pull/13156

v17 is already released, and this is a late documentation. For the purposes of review, I've only updated docs/17.0, but once approved, I will copy+paste the changes into docs/18.0 as well. These will be hopefully shortly updated with the new functionality introduced in https://github.com/vitessio/vitess/pull/13270 and some expected followups.

RFC: https://github.com/vitessio/vitess/issues/11227

Please review but do not merge yet

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[shlomi-noach]

Previews for affected pages:

• https://deploy-preview-1524--vitess.netlify.app/docs/17.0/user-guides/operating-vitess/backup-and-restore/overview/
• https://deploy-preview-1524--vitess.netlify.app/docs/17.0/user-guides/operating-vitess/backup-and-restore/creating-a-backup/
• https://deploy-preview-1524--vitess.netlify.app/docs/17.0/user-guides/operating-vitess/backup-and-restore/bootstrap-and-restore/
• https://deploy-preview-1524--vitess.netlify.app/docs/17.0/reference/features/recovery/

[mattlord]

Should this PR fix https://github.com/vitessio/website/issues/1490 ?

[shlomi-noach]

Indeed.

Fixes https://github.com/vitessio/website/issues/1490.

[shlomi-noach]

I will now copy all changes over to v18 and merge.