Add "sanitize" URL parameter for repository SVG hero image

Without the paramerter, GitHub won't response with the correct MIME type
but text resulting in an unrendered image in the Markdown files.

GH-82

README.md

@@ -1,4 +1,4 @@
-<p align="center"><a href="https://www.nordtheme.com/ports/atom-ui" target="_blank"><img src="https://raw.githubusercontent.com/arcticicestudio/nord-docs/develop/assets/images/ports/atom-ui/repository-hero.svg"/></a></p>
+<p align="center"><a href="https://www.nordtheme.com/ports/atom-ui" target="_blank"><img src="https://raw.githubusercontent.com/arcticicestudio/nord-docs/develop/assets/images/ports/atom-ui/repository-hero.svg?sanitize=true"/></a></p>
 
 <p align="center"><a href="https://github.com/arcticicestudio/nord-atom-ui/releases/latest" target="_blank"><img src="https://img.shields.io/github/release/arcticicestudio/nord-atom-ui.svg?style=flat-square&label=Release&logo=github&logoColor=eceff4&colorA=4c566a&colorB=88c0d0"/></a> <a href="https://www.nordtheme.com/docs/ports/atom-ui" target="_blank"><img src="https://img.shields.io/github/release/arcticicestudio/nord-atom-ui.svg?style=flat-square&label=Docs&colorA=4c566a&colorB=88c0d0&logo=data%3Aimage%2Fsvg%2Bxml%3Bbase64%2CPHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiI%2BCiAgICA8cGF0aCBmaWxsPSIjZDhkZWU5IiBkPSJNMTMuNzQ2IDIuODEzYS42Ny42NyAwIDAgMC0uNTU5LS4xMzNMOCAzLjg0OGwtNS4xODgtMS4xOGEuNjY5LjY2OSAwIDAgMC0uNTcuMTMzLjY3Ny42NzcgMCAwIDAtLjI0Mi41MzF2OC4xMzNjLS4wMDguMzIuMjEuNTk4LjUyLjY2OGw1LjMzMiAxLjE5OWguMjk2bDUuMzMyLTEuMmEuNjY4LjY2OCAwIDAgMCAuNTItLjY2N1YzLjMzMmEuNjU5LjY1OSAwIDAgMC0uMjU0LS41MnpNMy4zMzIgNC4xNjhsNCAuODk4djYuNzY2bC00LS44OTh6bTkuMzM2IDYuNzY2bC00IC44OThWNS4wNjZsNC0uODk4em0wIDAiLz4KPC9zdmc%2BCg%3D%3D"/></a> <a href="https://github.com/arcticicestudio/nord-atom-ui/blob/develop/CHANGELOG.md" target="_blank"><img src="https://img.shields.io/github/release/arcticicestudio/nord-atom-ui.svg?style=flat-square&label=Changelog&logo=github&logoColor=eceff4&colorA=4c566a&colorB=88c0d0"/></a></p>