## Issue being fixed or feature implemented
Remove dash-qt from docker images; save ~41MB
## What was done?
## How Has This Been Tested?
Hasn't
## Breaking Changes
I guess in theory someone could've been relying on dash-qt from docker 🤷
## Checklist:
_Go over all the following points, and put an `x` in all the boxes that
apply._
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [ ] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone _(for repository
code-owners and collaborators only)_
