### What problem does this PR solve?
feat: modify DuckDuckGo's style #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: add duckduckgo icon #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
feat: add icon to graph nodes #918
### Type of change
- [x] New Feature (non-breaking change which adds functionality)