[Page] Reduce vertical spacing

[kyledurand]

WHY are these changes introduced?

Part of #4539

Before	After

WHAT is this pull request doing?

How to 🎩

🖥 Local development instructions
🗒 General tophatting guidelines
📄 Changelog guidelines

Copy-paste this code in playground/Playground.tsx:

import React from 'react';
import {Page} from '../src';

export function Playground() {
  return (
    <Page title="Playground">
      {/* Add the code you want to test in here */}
    </Page>
  );
}

🎩 checklist

• Tested on mobile
• Tested on multiple browsers
• Tested for accessibility
• Updated the component's README.md with documentation changes
• Tophatted documentation changes in the style guide
• For visual design changes, ping @ sarahill to update the Polaris UI kit

[github-actions]

size-limit report

Path	Size
cjs	163.38 KB (0%)
esm	96.12 KB (0%)
esnext	143.04 KB (+0.01% 🔺)
css	34.52 KB (+0.02% 🔺)