chore: Updated foreground and cursor color for more contrast in default output

[emirror-de]

• Please check if the PR fulfills these requirements

• [x] Placed theme file in themes directory

• [x] Updated schemes.yaml file

• Link to the source repository

Original repo

• Modifications

• [ ] Copied from source without modification

• [X] Minor modifications (changed few colors for clear visibility)

• [ ] Heavily modified (almost all the colors are modified)