Not released yet

### 💅 Polish
- [Script for add/remove slave DNS server [FEATURE REQUEST] #313](https://github.com/stefanpejcic/OpenPanel/issues/313)
- [stop using cdn and locally build css/js files #484](https://github.com/stefanpejcic/OpenPanel/issues/484)

### 🐛 Bug Fixes
- fixed css bugs in OpenPanel Dashboard, FileManager and Contianers pages.
- fixed bugs with FileManager, PHP, MySQL and Domains modules missing from OpenPanel sidebar menu.
- fixed bug with ip address not being displayed in Dashboard widget.