Update README.md

Author: help-14

README.md

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 # Magma Dashboard
 Personal dashboard that is highly customizable, lightweight and responsive.
 
-![Magma dashboard preview](https://i.imgur.com/ehcCstY.png)
+![Magma dashboard preview](./docs/screenshots/flame.png)
 
 ## Features
 * Lightweight (8-16Mb), fast, build from Go