Add Vale linter for doc quality checks

Description

The Vale Linter (natural language linter) implements spell check and other basic rules.

_https://github.com/errata-ai/vale

Proposed Changes:

1.Integrate a natural language linter like Vale into the Prometheus Operator documentation workflow. 2.Implement spell check and grammar rules to ensure consistent language usage across all documentation pages. 3.Define style libraries and extension points within the linter to enforce project-specific writing guidelines and conventions. 4.Configure the linter to check for common writing errors, improve readability, and suggest enhancements for technical content. 5.Provide guidelines and documentation on how contributors can use the linter during the documentation writing and review process.

Benefits:

Improved documentation quality with consistent spelling, grammar, and style. Enhanced readability and understanding of technical content for users and contributors. Facilitates collaboration by establishing clear writing standards and guidelines. Supports the long-term maintainability and scalability of the Prometheus Operator documentation.

Describe alternatives you've considered.

No response