Security terms glossary (Fixes #7802)

[arky]

Description

Add a glossary to the Getting started section of the Wazuh documentation.

Add a glossary to the security documentation. A glossary will help clarify technical terms, making the documentation more accessible to a wider audience, including non-technical users.

Closes #7802

Checks

Docs building

• [x ] Compiles without warnings.

Code formatting and web optimization

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

Writing style

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