docs(other): add screenshots for navigation elements

[JLekawa]

What/Why/How?

Adds screenshots of navigation elements, adds missing page action items.

Reference

Closes https://github.com/Redocly/redocly/issues/21467

Testing

Screenshots (optional)

Check yourself

• Code is linted
• Tested
• All new/updated code is covered with tests

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

[redocly]

marketing-site AI Review: 🟢 Completed

Reunite Bot has reviewed your changes and found 6 potential issue(s).

Note

Low Risk

This PR contains only documentation additions and image assets. There is no risk to application behavior, functionality, or affected systems.

Overview

Adds 15 new screenshot images to the docs/end-user/images directory to visually supplement documentation for end-user interface elements.

Updates navigate-project.md and interact-with-pages.md by embedding these images using the {% img %} shortcode. Additionally, interact-with-pages.md has been updated to include missing page actions documentation for connecting to Cursor and VS Code via MCP. Includes minor formatting and wording adjustments (e.g., list numbering) for better consistency.

[redocly]

The alt text contains a grammatical error: "a open" should be "an open".