Removed reference for Wazuh indexer and dashboard mixed node from Readme file of production ready deployment with Ansible

[c-bordon]

The messages that made reference to the use of a shared node for Wazuh dashboard in the Readme are corrected, it did not require changes in the playbooks because this was already something that was contemplated, in fact the example inventory indicates the configuration of a specific node for Wazuh dashboard

close wazuh/wazuh-ansible#1086

Description

Checks

Docs building

• Compiles without warnings.

Code formatting and web optimization

• Uses three spaces indentation.
• Adds or updates meta descriptions accordingly.
• Updates the redirects.js script if necessary (check this guide).

Writing style

• Uses present tense, active voice, and semi-formal registry.
• Uses short, simple sentences.
• Uses bold for user interface elements, italics for key terms or emphasis, and code font for Bash commands, file names, REST paths, and code.