Don't wget files that are already in the repo on release

These lines in our release pipeline should not exist
```
wget --output-document thunderstore/icon.png https://raw.githubusercontent.com/R2Northstar/Northstar/main/thunderstore/icon.png
wget --output-document thunderstore/README.md https://raw.githubusercontent.com/R2Northstar/Northstar/main/thunderstore/README.md
```
