Update Images and manifest for NitroX

[derdj2301]

Type of change

• [ ] Add new directory for a server
• [x] Update directory of a server
• [ ] Documentation Update

Checklist

• [x] I have read the README doc
• [x] I have compressed the images appropriately (e.g. on https://tinypng.com)
• [x] I have created the manifest.json with the required values

Further comments