Rename CLI commands from harperdb to harper

### Issue Type

Outdated information

### Content Location

https://docs.harperdb.io/docs/deployments/harper-cli

### What's wrong?

All of the CLI commands are things like harperdb install ... this is confusing given both harper install and harperdb work but from a brand/clarity perspective in the docs the examples should be harper

### Suggested improvement

_No response_

### Additional context

_No response_

### Are you planning to fix this issue?

No, just reporting the issue

### First-time contributor support

- [ ] I'm new to contributing and would appreciate guidance on the process
- [ ] I'd like help understanding the project structure
- [ ] I need assistance with setting up the development environment
- [ ] I'm comfortable contributing but new to this project specifically