fix(theme): homepage mask based on logo vertical centering

[seeintea]

Summary

Make the homepage mask vertically centered based on the logo.
Now the height of the mask is fixed, I'm not sure if this needs to be changed or not.

Related Issue

#897 [Bug]: The position of the homepage mask is offset from the logo

Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

[CLAassistant]

All committers have signed the CLA.

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