docs(angular): add accessibility content (#6448)

src/data/roadmaps/angular/content/accessibility@VNG9DdXlS6R1OJ6Lrn4Lt.md

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 # Accessibility
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+The web is used by a wide variety of people, including those who have visual or motor impairments. A variety of assistive technologies are available that make it much easier for these groups to interact with web-based software applications. Also, designing an application to be more accessible generally improves the user experience for all users.
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+Visit the following resources to learn more:
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+- [@official@Angular Official Docs - Accessibility](https://angular.dev/best-practices/a11y)
+- [@course@Learn Accessibility](https://web.dev/learn/accessibility/)
+- [@article@Angular a11y: 11 tips on how to make your apps more accessible](https://angularindepth.com/posts/1152/angular-a11y-11-tips-on-how-to-make-your-apps-more-accessible)