Proposed: Rename `needs-ui` to `needs-design`

[nelsonic]

In light of notes-on-naming I propose we change the needs-ui (i.e. "needs user interface"...) to needs-design.
The advantage of design is that it is more widely applicable to our non-software issues too. 💭
https://github.com/dwyl/labels/labels

[nelsonic]

🦗 ...

[nelsonic]

Made the "executive decision" to rename. ✅

But sadly, it doesn't UPDATE the label text when we do a label-sync:
https://github.com/dwyl/mvp/labels

Perhaps we aren't transferring over the id of the label ... 💭
So I had to manually apply remove the "old' label from the issues that had it and apply the new label to them. ⏳