SDK: Adding Editable Listing Page Example to NextJS, Angular, and Astro Examples

[fmontes]

Task description

As a developer, I want to know what is the best approach to render a listing page which is also editable in UVE in NextJS, Angular, or Astro.

### Acceptance Criteria
- [ ] The NextJS, Angular, and Astro examples should be updated with a clear and concise example of an editable listing page.
- [ ] The example should demonstrate how to render a listing page with editable content fields.
- [ ] Users should be able to understand and replicate the process of creating an editable listing page based on the provided example.
- [ ] The updated examples should be well-documented and easy to follow for developers of all skill levels.

External Links

N/A

Assumptions & Initiation Needs

• Assumption: Users are familiar with NextJS, Angular, and Astro frameworks.
• Initiation needs: Access to the existing examples and documentation for NextJS, Angular, and Astro.

Quality Assurance Notes & Workarounds

N/A