[SkeletonPage] Fix title / actions layout (#7442)

### WHY are these changes introduced?

I needed to fix this to take a nice screenshot for the styleguide

Fixes #5241

### WHAT is this pull request doing?

Before | After
---|---
![localhost_6006_iframe html_args=
id=all-components-skeletonpage--with-dynamic-content
viewMode=story(iPhone SE)
(1)](https://user-images.githubusercontent.com/6844391/196540726-8aad7281-2582-4b6e-83aa-f3ced0e314ae.png)
| ![localhost_6006_iframe html_args=
id=all-components-skeletonpage--with-dynamic-content
viewMode=story(iPhone
SE)](https://user-images.githubusercontent.com/6844391/196540787-7ea0d74f-1a8c-419f-b520-a2dd1855989b.png)

### How to 🎩

🖥 [Local development
instructions](https://github.com/Shopify/polaris/blob/main/README.md#local-development)
🗒 [General tophatting
guidelines](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md)
📄 [Changelog
guidelines](https://github.com/Shopify/polaris/blob/main/.github/CONTRIBUTING.md#changelog)

<!--
  Give as much information as needed to experiment with the component
  in the playground.
-->

<details>
<summary>Copy-paste this code in
<code>playground/Playground.tsx</code>:</summary>

```jsx
import React from 'react';

import {
  Card,
  Layout,
  Page,
  SkeletonBodyText,
  SkeletonDisplayText,
  SkeletonPage,
  TextContainer,
} from '../src';

export function Playground() {
  return (
    <>
      <Page title="Orders" primaryAction={{content: 'New order'}} />
      <WithDynamicContent />
      <WithStaticContent />
    </>
  );
}

export function WithDynamicContent() {
  return (
    <SkeletonPage primaryAction>
      <Layout>
        <Layout.Section>
          <Card sectioned>
            <SkeletonBodyText />
          </Card>
          <Card sectioned>
            <TextContainer>
              <SkeletonDisplayText size="small" />
              <SkeletonBodyText />
            </TextContainer>
          </Card>
          <Card sectioned>
            <TextContainer>
              <SkeletonDisplayText size="small" />
              <SkeletonBodyText />
            </TextContainer>
          </Card>
        </Layout.Section>
        <Layout.Section secondary>
          <Card>
            <Card.Section>
              <TextContainer>
                <SkeletonDisplayText size="small" />
                <SkeletonBodyText lines={2} />
              </TextContainer>
            </Card.Section>
            <Card.Section>
              <SkeletonBodyText lines={1} />
            </Card.Section>
          </Card>
          <Card subdued>
            <Card.Section>
              <TextContainer>
                <SkeletonDisplayText size="small" />
                <SkeletonBodyText lines={2} />
              </TextContainer>
            </Card.Section>
            <Card.Section>
              <SkeletonBodyText lines={2} />
            </Card.Section>
          </Card>
        </Layout.Section>
      </Layout>
    </SkeletonPage>
  );
}

export function WithStaticContent() {
  return (
    <SkeletonPage title="Products" primaryAction>
      <Layout>
        <Layout.Section>
          <Card sectioned>
            <SkeletonBodyText />
          </Card>
          <Card sectioned title="Images">
            <SkeletonBodyText />
          </Card>
          <Card sectioned title="Variants">
            <SkeletonBodyText />
          </Card>
        </Layout.Section>
        <Layout.Section secondary>
          <Card title="Sales channels">
            <Card.Section>
              <SkeletonBodyText lines={2} />
            </Card.Section>
            <Card.Section>
              <SkeletonBodyText lines={1} />
            </Card.Section>
          </Card>
          <Card title="Organization" subdued>
            <Card.Section>
              <SkeletonBodyText lines={2} />
            </Card.Section>
            <Card.Section>
              <SkeletonBodyText lines={2} />
            </Card.Section>
          </Card>
        </Layout.Section>
      </Layout>
    </SkeletonPage>
  );
}

```

</details>

### 🎩 checklist

- [ ] Tested on
[mobile](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md#cross-browser-testing)
- [ ] Tested on [multiple
browsers](https://help.shopify.com/en/manual/shopify-admin/supported-browsers)
- [ ] Tested for
[accessibility](https://github.com/Shopify/polaris/blob/main/documentation/Accessibility%20testing.md)
- [ ] Updated the component's `README.md` with documentation changes
- [ ] [Tophatted
documentation](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting%20documentation.md)
changes in the style guide

Author: kyledurand

.changeset/weak-readers-notice.md

@@ -0,0 +1,5 @@
+---
+'@shopify/polaris': patch
+---
+
+Fix SkeletonPage actions layout

polaris-react/src/components/SkeletonPage/SkeletonPage.scss

@@ -34,10 +34,7 @@ $skeleton-display-text-max-width: 120px;
 
 .TitleAndPrimaryAction {
   display: flex;
-
-  @media #{$p-breakpoints-lg-down} {
-    display: block;
-  }
+  align-items: flex-start;
 }
 
 .TitleWrapper {
@@ -73,20 +70,6 @@ $skeleton-display-text-max-width: 120px;
     height: $primary-action-button-height;
     min-width: $primary-action-button-width;
   }
-
-  @media #{$p-breakpoints-lg-down} {
-    margin-top: var(--p-space-4);
-    margin-bottom: calc(-1 * var(--p-space-2));
-  }
-
-  @media #{$p-breakpoints-sm-up} {
-    margin-top: var(--p-space-2);
-    margin-bottom: calc(-1 * var(--p-space-2));
-  }
-
-  @media #{$p-breakpoints-md-up} {
-    margin-top: 0;
-  }
 }
 
 .Actions {