Bump cookie and @x-govuk/govuk-prototype-components in /guide (#564)

Removes [cookie](https://github.com/jshttp/cookie). It's no longer used
after updating ancestor dependency
[@x-govuk/govuk-prototype-components](https://github.com/x-govuk/govuk-prototype-components).
These dependencies need to be updated together.

Removes `cookie`

Updates `@x-govuk/govuk-prototype-components` from 3.0.6 to 3.0.9
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/x-govuk/govuk-prototype-components/releases"><code>@​x-govuk/govuk-prototype-components</code>'s
releases</a>.</em></p>
<blockquote>
<h2>v3.0.9</h2>
<ul>
<li>Remove <code>govuk-prototype-kit</code> as a dependency ff53ccc</li>
<li>Add a deprecation warning to primary navigation styles  1e27977</li>
<li>Update deprecation notice for primary navigation in documentation
adfce53</li>
<li>Update dependencies  f0dba77</li>
</ul>
<p><a
href="https://github.com/x-govuk/govuk-prototype-components/compare/v3.0.8...v3.0.9">https://github.com/x-govuk/govuk-prototype-components/compare/v3.0.8...v3.0.9</a></p>
<h2>v3.0.8</h2>
<ul>
<li>Add notification banner to primary navigation component 84778fa</li>
<li>Pass attributes option to items in autocomplete component
a7981b2</li>
<li>Update dependencies  bda2bb7</li>
</ul>
<p><a
href="https://github.com/x-govuk/govuk-prototype-components/compare/v3.0.7...v3.0.8">https://github.com/x-govuk/govuk-prototype-components/compare/v3.0.7...v3.0.8</a></p>
<h2>v3.0.7</h2>
<ul>
<li>Use alternative method of preventing margin collapse in masthead
component. Fixes <a
href="https://redirect.github.com/x-govuk/govuk-prototype-components/issues/245">#245</a>.
Thanks <a href="https://github.com/vickytnz"><code>@​vickytnz</code></a>
for reporting. 28107a6</li>
<li>Update dependencies  e51736f f51f5b6 6e9ab66</li>
</ul>
<p><a
href="https://github.com/x-govuk/govuk-prototype-components/compare/v3.0.6...v3.0.7">https://github.com/x-govuk/govuk-prototype-components/compare/v3.0.6...v3.0.7</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/4fb0a6b5bb5d3ab95b5ea9529057dea0f7291e34"><code>4fb0a6b</code></a>
3.0.9</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/f0dba779b4e9aa8f68ee0baa6fde07896a2e540b"><code>f0dba77</code></a>
Update dependencies</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/ff53cccc795f48412a0c2ed85325ba8933d1385c"><code>ff53ccc</code></a>
Remove govuk-prototype-kit as a dependency</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/1e279772eb87e56b3815faf8c09088f2b6c23d40"><code>1e27977</code></a>
Add a deprecation warning to primary navigation styles</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/adfce533fc095a7e71e3dd70e0a77b14782620b8"><code>adfce53</code></a>
Update deprecation notice for primary navigation in documentation</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/c846eb79a7348cccdf9f7d8d285c2ddd030fa8e4"><code>c846eb7</code></a>
3.0.8</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/84778fa6c0135b3dfbf50081ee1643efa0801cf2"><code>84778fa</code></a>
Add notification banner to primary nav component</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/a7981b24068b72c3abd1763cd575062fad85ebbd"><code>a7981b2</code></a>
Pass attributes option to items in autocomplete component</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/bda2bb7de4664fb20a6a226daae8fc0cf1d83c5e"><code>bda2bb7</code></a>
Update dependencies</li>
<li><a
href="https://github.com/x-govuk/govuk-prototype-components/commit/e3137331020a44eae71a198e687c67467a07d5ca"><code>e313733</code></a>
3.0.7</li>
<li>Additional commits viewable in <a
href="https://github.com/x-govuk/govuk-prototype-components/compare/v3.0.6...v3.0.9">compare
view</a></li>
</ul>
</details>
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