Add the KB about how to delete a node

[w13915984028]

Problem:

https://docs.harvesterhci.io/v1.8/host/#7-remove-the-node has some missing details, and also not the best fit to add everything there.

Solution:

Add a KB.

Related Issue(s):

harvester/harvester#11349

Test plan:

Additional documentation or context

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[Copilot]

Pull request overview

Adds a new Knowledge Base (KB) article documenting a safe, step-by-step procedure for deleting a single Harvester node, expanding on the existing host documentation by covering CAPI Machine cleanup, RKE2 uninstall, and control-plane/etcd leadership considerations.

Changes:

• Introduces a new KB guide: “How To Delete One Harvester Node”.
• Documents control-plane node removal precautions (quorum and etcd leader transfer).
• Provides an end-to-end removal flow (cordon/drain → rke2 uninstall → delete CAPI Machine → delete Kubernetes Node → disk cleanup), with screenshots.

Suppressed comments (1)

kb/2026-08-05/how_to_delete_one_node.md:275

• The example command is currently written as a blockquote (> prefixes) inside the warning admonition, which can break copy/paste formatting. Use a normal code block (no > prefixes).

> ```bash
> # Example: Clear filesystem and partition signatures on the primary drive
> wipefs -a /dev/sdX
> ```

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[ibrokethecloud]

deleting the node should clean up the machine object.
do we want to change the doc to ask users to delete node first and then clean up machine object if one still exists after node deletion?

[w13915984028]

Thanks.

After multi tests via harvester/harvester#11349 (comment), the machine object is effectively removed by node deletion automatically, but fleet-agent deployment could cause issues on some cases.

Both #114 and harvester/docs#1108 are updated accordingly. Please take a new look.

[w13915984028]

PR is ready for review, thanks.