install btop on Debian

```
wget http://ftp.de.debian.org/debian/pool/main/b/btop/btop_1.2.13-1_amd64.deb
```

## Links
- https://pkgs.org/search/?q=btop
- https://www.pc-freak.net/blog/install-btop-debian-linux-btop-advanced-htop-monitoring-linux-beautify-console-life/