docs(contributing): update the feature development workflow

[kisvegabor]

Description of the feature or fix

The current shaping/pitching workflow wasn't really took off. Now I also feel like it's too complicated and not intuitive enough.

I think we should be good with having an issue template too where we can see all the important aspects of the larger features.

Notes

• Update the Documentation if needed.
• Add Examples if relevant.
• Add Tests if applicable.
• If you added new options to lv_conf_template.h run lv_conf_internal_gen.py and update Kconfig.
• Run scripts/code-format.py (astyle needs to be installed) and follow the Code Conventions
• Mark the Pull request as Draft while you are working on the first version, and mark is as Ready when it's ready for review.
• When changes were requested, re-request review to notify the maintainers.
• Help us to review this Pull Request! Anyone can approve or request changes.

[kisvegabor]

Fixed, thanks!