Updated npmignore to remove custom config files from release (#10614)
Updated npmignore to remove custom config files from release (#10614)

no issue

- Ignores custom config.*.json files on npm operations(e.g pack)
- Release process also ignores any custom config files leaked
janvt/Ghost,ErisDS/Ghost,bitjson/Ghost,Gargol/Ghost,JohnONolan/Ghost,ErisDS/Ghost,TryGhost/Ghost,bitjson/Ghost,e10/Ghost,e10/Ghost,Kikobeats/Ghost,kevinansfield/Ghost,Kikobeats/Ghost,JohnONolan/Ghost,kevinansfield/Ghost,Gargol/Ghost,kevinansfield/Ghost,ErisDS/Ghost,TryGhost/Ghost,janvt/Ghost,Kikobeats/Ghost,JohnONolan/Ghost,TryGhost/Ghost