[Howto]: Create apache ServerAlias for project name (without TLD_SUFFIX)

### Have you already checked elsewhere?

- [X] I have read the [Devilbox documentation](https://devilbox.readthedocs.io/en/latest/)
- [ ] I have checked the [Devilbox Troubleshooting Guide](https://devilbox.readthedocs.io/en/latest/)
- [ ] I have checked the [Devilbox FAQ](https://devilbox.readthedocs.io/en/latest/support/faq.html)
- [ ] I have checked the [Devilbox Howto](https://devilbox.readthedocs.io/en/latest/support/howto.html)
- [ ] I have checked the [Devilbox Forum](https://devilbox.discourse.group/)
- [X] I have checked [existing issues](https://github.com/cytopia/devilbox/issues)
- [X] I have googled already with no luck
- [ ] I have not done any of the above

### What are you struggling with?

vhost-gen creates Apache config with `ServerName` equal to \.\

I'd like to create a `ServerAlias` which is just equal to \. That is, **without** the TLD_SUFFIX added.

### What have you tried already?

From what I can tell, as \ is not available for use in the vhost-get tempates. Therefore in order to use a project name within, one must copy the template to that project directory and edit it and just hard code the project name within.

### What is your goal?

I actually want to do this as have DevilBox running behind a separate nginx proxy. The proxy handles requests from the outside internet to `example.com`, which have to be forwarded to `example.com.tld_suffix` within the LAN. This works great, but does not work if nginx is configured with `proxy_set_header Host $http_host;` - to correctly handle those Devilbox needs an alias of `example.com` adding.