Iotix: Update theme and prepare for Dotorg submission

[beafialho]

Changes from WordPress Playground, include:

• Update screenshot with correct dimensions
• Visual adjustments to theme (spacings, global styles)
• Buttons

I don't know if the images were localized correctly, please whoever reviews this, can you check?

[jasmussen]

Same question as the others, how can I help unblock this one? I can help fix the conflicts and get this landed if that helps!