feat(cat-voices): try out new minimal template

[dt-iohk]

Description

A PR for testing a minimal proposal template.

Screenshots

Demo video from proposal builder:
https://github.com/user-attachments/assets/0c58909f-ae33-4a40-97f5-46e89df9fc3a

Unit tests results validating that all required properties exist and can be understood by the application:

• summary.time.duration - ❌
• milestones.milestones.milestone_list - ❌
• theme.theme.grouped_tag - ❌

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[damian-molinski]

New format implemented in #3473