Add example gallery and metis mask back in

[hayesla]

Describe the feature

Following PR #8641 being merged we now need to add back in masking the occulter (following discussion it should live here instead of sunkit-instruments)

an example gallery and docs with the clipping values in original pr

Proposed solution

No response

[hayesla]

@Hermanlrx

[hayesla]

now that the PR is merged (🥳) it would be great to get this is soon-ish ;) if you need any help @Hermanlrx about whats needed here let us know

[Hermanlrx]

I'll get on it asap!