Fixed logo appearing in docs index

docs/index.md

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 OwaspHeaders.Core is an ASP.NET Core middleware designed to increase web application security by adopting the [OWASP] recommended values for HTTP headers as per the [OWASP Secure Headers] project into all responses generated by the ASP.NET Core pipeline.
 
-![](../../assets/images/icon.png)
+![](./assets/images/icon.png)
 
 Listing and commenting on the default values that this middleware provides is out of scope for this index page, but you can read about each of the default values in the [Configuration] section