Update SUPPORTED_NAS_OS.md

docs/SUPPORTED_NAS_OS.md

@@ -4,11 +4,12 @@ These are the officially supported NAS OS's (with documentation and setup guides
 Once a guide is created (in `docs/guides/`) it will be linked here.
 
 - [ ] freenas/truenas
-- [x] [unraid](https://github.com/AnalogJ/scrutiny/blob/master/docs/INSTALL_UNRAID.md)
+- [x] [unraid](./INSTALL_UNRAID.md)
 - [ ] ESXI
 - [ ] Proxmox
 - [ ] Synology
 - [ ] OMV
 - [ ] Amahi
 - [ ] Running in a LXC container
+- [ ] [PFSense](./INSTALL_UNRAID.md)