Remove image width, since I can't get the system to use it...

Signed-off-by: Felix Fontein <felix@fontein.de>

Author: felixfontein

content/en/docs/_index.md

@@ -2310,6 +2310,6 @@ encrypted files by hand\...
 
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-![CNCF Sandbox Project](docs/images/cncf-color-bg.svg){width="400px"}
+![CNCF Sandbox Project](docs/images/cncf-color-bg.svg)
 
 **We are a [Cloud Native Computing Foundation](https://cncf.io) sandbox project.**