[search][xl]: initial search page with essential components.

- No pagination at the moment.
- Sorting isn't functional yet.
- Search works - we only have mocks for searching 'gdp' param.

components/search/Input.tsx

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+import { useState } from 'react'
+import { useRouter } from 'next/router'
+import Link from 'next/link'
+
+export default function Input({ query }) {
+  const router = useRouter()
+  const [q, setQ] = useState(query.q)
+
+  const handleChange = (event) => {
+    setQ(event.target.value)
+  }
+
+  const handleSubmit = (event) => {
+    event.preventDefault()
+    router.push({
+      pathname: '/search',
+      query: { q },
+    })
+  }
+
+  return (
+    <form onSubmit={handleSubmit}>
+      <input
+         type='text'
+         name='q'
+         value={q}
+         onChange={handleChange}
+         placeholder='Search'
+         aria-label='Search'
+       />
+    </form>
+  )
+}

components/search/Item.tsx

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+import Link from 'next/link'
+
+export default function Item({ datapackage }) {
+  return (
+    <div>
+      <h3 className="text-2xl font-semibold">
+        <Link href={`/@${datapackage.organization ? datapackage.organization.name : 'dataset'}/${datapackage.name}`}>
+          <a className="text-primary">{ datapackage.title || datapackage.name }</a>
+        </Link>
+      </h3>
+      <Link href={`/@${datapackage.organization ? datapackage.organization.name : 'dataset'}`}>
+        <a className="text-gray-500 block mt-1">
+          { datapackage.organization ? datapackage.organization.title : 'dataset' }
+        </a>
+      </Link>
+      <div className="leading-relaxed mt-2">
+        { datapackage.description }
+      </div>
+    </div>
+  )
+}

components/search/List.tsx

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+import Item from './Item'
+
+export default function List({ datapackages }) {
+  return (
+    <ul>
+      {datapackages.map((datapackage, index) => <Item datapackage={datapackage} key={index} />)}
+    </ul>
+  )
+}

components/search/Sort.tsx

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+export default function Sort({ selected }) {
+  return (
+    <div>
+      <label htmlFor="field-order-by">Order by:</label>
+      <select className="bg-white" id="field-order-by" name="sort">
+        <option value="score:desc">Relevance</option>
+        <option value="title_string:asc">Name Ascending</option>
+        <option value="title_string:desc">Name Descending</option>
+        <option value="metadata_modified:desc">Last Modified</option>
+        <option value="views_recent:desc">Popular</option>
+      </select>
+    </div>
+  )
+}

components/search/Total.tsx

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+export default function Total({ total }) {
+  return <h1 className="text-4xl font-semibold text-primary">{ total } results found</h1>
+}