Add ability to disable the edition of configuration through API endpoints and UI

[Desvelao]

This pull requests add a plugin setting to the configuration file to manage the ability to configure the the configuraiton from API endpoints and UI.

• Add configuration.ui_api_editable setting to the configuration file specification

Description

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

• [ ] 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.