Fix false positive JS reliance for WordPress sites and bump version to 2.1.3

feat: Implement a warning message for inaccessible pages and refactor warning styles and classes.

fix: update plugin access menu name in readme

feat: Extend CSS styling to include the `.ai-seo-readiness-wrapper` class in existing selectors for broader application.

style: Improve CSS formatting and add theme override rules to prevent conflicts with external themes.

fix: Add theme override styles to normalize capitalization, input fields, button appearance, and heading spacing.

refactor: Update readability scoring logic to use accessible sentence percentage and refine evidence messages, and add a .gitignore file.

refactor: Rename plugin UI elements and slugs to "AI SEO Readiness Auditor" and update contributor name and README heading.

docs: update installation instructions to use the WordPress plugin upload method.

fix: Correct release workflow to copy plugin files directly from the repository root.

feat: Introduce plugin update checker with localization and a release workflow, and integrate it into the main plugin file.

feat: add README.md outlining the AI SEO Readiness Auditor plugin's features, scoring, installation, and usage.

feat: Implement initial AI SEO Auditor plugin with JS dependency detection, comprehensive scoring rules, and result display.