Remove the "Why Here?" field from the project proposal form
Consider removing the **"Why Here?"** field from the project proposal form. While this question was useful in the past, it may no longer provide enough value to justify including it in the form.
The existing data should be preserved. Proposal pages should continue to display the field when it contains a value, but it should no longer be shown for new proposals or when no value exists.
## Requirements
* [ ] Remove the **"Why Here?"** field from the proposal form.
* [ ] Preserve existing data in project proposal nodes.
* [ ] Continue displaying the field for existing proposals where a value is present.
**Original issue:**
https://gitlab.eclipse.org/eclipsefdn/software-dev/websites/projects.eclipse.org/-/work_items/456#note_6864377
/cc @carmendelgado @wbeaton
issue