fix(grafana): fix issues #329

[Chever-John]

As title says.

This PR aimed to solve #329 .

The source of this problem is from the APISIX Dashboard project. This is because it has updated the CSP (content security policy) feature. This caused the site to need to configure some security policy in order to display properly.

One more note, the Dashboard project's default configuration file has this optional configuration added, but it was problematic, so I submitted a PR. You can see its default configuration options via this link to see its default configuration options.

[Chever-John]

I hope you can add a comment in the description of the PR, or in the configuration file, explaining the specific meaning of each line modification. Thanks

Yes, I've updated the description.

[Chever-John]

Can anyone update the progress? Because the PR associated with it has already been merged. So it shouldn't be too much of a problem in general.

@tao12345666333 @bzp2010

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