fix: update image path in GRUB documentation

Author: Spina02

docs/content/docs/configs/GRUB.md

@@ -145,7 +145,7 @@ To customize GRUB we can create a theme from zero or use an existing one. There
 {{% alert context="mycase" %}}
 I personally choose the [**Arcade**](https://github.com/nobreDaniel/dotfile) theme, this is the result:
 
-<img src="assets/images/grub.jpeg" alt="GRUB theme screenshot" style="display: block; margin: 0 auto; max-width: 60%; height: auto; border-radius: 10px;" />
+<img src="/assets/images/grub.jpeg" alt="GRUB theme screenshot" style="display: block; margin: 0 auto; max-width: 60%; height: auto; border-radius: 10px;" />
 
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