feat: preheat document remove Configuration (#178)

Signed-off-by: zhaoxinxin <[email protected]>

docs/advanced-guides/preheat.md

@@ -11,19 +11,6 @@ namely Open API preheat, console preheat and harbor preheat.
 
 Use Open API to preheat.
 
-### Configuration
-
-If the client is `containerd`, it is recommended to configure `proxy.defaultFilter` in dfget.yaml and set it to `Expires&Signature&ns`,
-because containerd will add `ns` query params to the blobs download URL,
-refer to [containerd/remotes/docker/resolver.go](https://github.com/containerd/containerd/blob/main/remotes/docker/resolver.go#L493).
-Which will cause the generated Task ID to be different from the preheat Task ID, so it is impossible to hit the preheat blobs.
-
-```yaml
-# proxy service detail option
-proxy:
-  defaultFilter: 'Expires&Signature&ns'
-```
-
 ### Create personal access token
 
 Click the `ADD PERSONAL ACCESS TOKENS` button to create personal access token.