fix: allows images from gnolang.github.io in csp

[alexiscolin]

Related to #3619, this PR is a hotfix for blog images from gno.land until a proper generic whitelisted image provider is implemented.

Or do we want to use base64 and replace all images from blog and realm instead?

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/cmd/gnoweb/main.go	0.00%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[thehowl]

Or do we want to use base64 and replace all images from blog and realm instead?

No please, let's use Github pages