Let's say you want to host domains first.com and second.com.
Create folders for their files:
| cd repository | |
| git checkout --orphan orphan_name | |
| git rm -rf . | |
| rm '.gitignore' | |
| echo "#Title of Readme" > README.md | |
| git add README.md | |
| git commit -a -m "Initial Commit" | |
| git push origin orphan_name |