Include a documentation page to explain a single node addition

[okynos]

Hello all,

Description

We need to include into our documentation pages a way to manage nodes addition to a pre-existing Wazuh indexer cluster. Currently, the way to add a node is described here https://github.com/wazuh/wazuh-packages/issues/1530#issuecomment-1241743340 When the mentioned issue is completed we will need to modify such documentation to adapt the new model.

Tasks

• [ ] Include Add Wazuh indexer node documentation page
  • [ ] Include the steps referred by the issue
• [ ] When the issue is completed update the mentioned documentation

Validators

• [ ] @alberpilot
• [ ] @DFolchA
• [ ] @okynos
• [ ] @s-ocando
• [ ] @javimed