chore: Cleanup page-top-bar style conflicts (#2407)

* chore: Class name cleanup page-top-bar.

* prettier spacing fixes

* Review fixes and adds storybook

* Circleci fixes

app/javascript/dashboard/components/layout/Sidebar.vue

@@ -264,10 +264,6 @@ export default {
   .modal-container {
     width: 40rem;
   }
-
-  .page-top-bar {
-    padding-bottom: $space-two;
-  }
 }
 
 .account-selector {

app/javascript/dashboard/components/widgets/SettingIntroBanner.stories.js

@@ -0,0 +1,30 @@
+import SettingIntroBanner from './SettingIntroBanner';
+
+export default {
+  title: 'Components/Settings/Banner',
+  component: SettingIntroBanner,
+  argTypes: {
+    headerTitle: {
+      defaultValue: 'Acme Support',
+      control: {
+        type: 'text',
+      },
+    },
+    headerContent: {
+      defaultValue:
+        'It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout.',
+      control: {
+        type: 'text',
+      },
+    },
+  },
+};
+
+const Template = (args, { argTypes }) => ({
+  props: Object.keys(argTypes),
+  components: { SettingIntroBanner },
+  template: '<setting-intro-banner v-bind="$props" ></setting-intro-banner>',
+});
+
+export const Banner = Template.bind({});
+Banner.args = {};

app/javascript/dashboard/components/widgets/SettingIntroBanner.vue

@@ -0,0 +1,33 @@
+<template>
+  <div class="column page-top-banner">
+    <h2 class="page-sub-title">
+      {{ headerTitle }}
+    </h2>
+    <p v-if="headerContent" class="small-12 column">
+      {{ headerContent }}
+    </p>
+    <slot></slot>
+  </div>
+</template>
+
+<script>
+export default {
+  props: {
+    headerTitle: {
+      type: String,
+      default: '',
+    },
+    headerContent: {
+      type: String,
+      default: '',
+    },
+  },
+};
+</script>
+<style lang="scss" scoped>
+.page-top-banner {
+  border-bottom: 1px solid var(--color-border);
+  background: var(--color-background-light);
+  padding: var(--space-normal) var(--space-large) 0;
+}
+</style>