Command line interface for the nxthdr platform.
```bash
cargo install nxthdr
```
```bash
nxthdr help
```
```bash
nxthdr login
nxthdr logout
```
```bash
nxthdr peering peerlab env > .env
```
This command automatically generates a PeerLab `.env` file using your assigned ASN and active prefix leases from nxthdr.