chore: Update readme and assets

README.md

@@ -1,11 +1,11 @@
 
-<p align="center"><img width="620px" src="http://i.imgur.com/CiYI98A.jpg"/></p>
+<p align="center"><img width="620px" src="assets/header.jpg"/></p>
 
 [![GitHub tag](https://img.shields.io/github/release/equinusocio/vsc-material-theme.svg?style=flat-square)](https://github.com/equinusocio/vsc-material-theme/releases)   [![GitHub tag](https://img.shields.io/github/issues/equinusocio/vsc-material-theme.svg?style=flat-square)](https://github.com/equinusocio/vsc-material-theme/issues)   [![Beerpay](https://beerpay.io/equinusocio/vsc-material-theme/badge.svg?style=beer)](https://beerpay.io/equinusocio/vsc-material-theme)
 
 The most epic theme meet Visual Studio Code. Please note that this theme is still in Beta (β) release. You can help by reporting issues [here](https://github.com/equinusocio/vsc-material-theme/issues)
 
-<p align="center"><img width="650px" src="https://cdn.rawgit.com/equinusocio/vsc-material-theme/develop/assets/screen.jpg"></p>
+<p align="center"><img width="650px" src="assets/screen.jpg"></p>
 
 # Easy installation
 You can install this awesome theme through the [Visual Studio Code Marketplace](https://marketplace.visualstudio.com/items?itemName=Equinusocio.vsc-material-theme).