docs: update maintenance status

Author: utkuozdemir

README.md

@@ -12,8 +12,8 @@ Nvidia GPU exporter for prometheus, using `nvidia-smi` binary to gather metrics.
 
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-⚠️ **Maintenance status**:
-I get that it can be frustrating not to hear back about the stuff you've brought up or the changes you've suggested. But honestly, for over a year now, I've hardly had any time to keep up with my personal open-source projects, including this one. I am still committed to keep this tool working and slowly move it forward, but please bear with me if I can't tackle your fixes or check out your code for a while. Thanks for your understanding.
+> [!WARNING]
+> **Maintenance Status:** I get that it can be frustrating not to hear back about the stuff you've brought up or the changes you've suggested. But honestly, for over a year now, I've hardly had any time to keep up with my personal open-source projects, including this one. I am still committed to keep this tool working and slowly move it forward, but please bear with me if I can't tackle your fixes or check out your code for a while. Thanks for your understanding.
 
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