Fix page title suffix (#66)

This updates the suffix for the `<title>` tags from `- GOV.UK` to `- NHS Digital prevention services design history`

Author: frankieroberto

eleventy.config.js

@@ -18,6 +18,7 @@ module.exports = function (eleventyConfig) {
         html: `<svg class="app-logo" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 80 32" height="40" aria-hidden="true" focusable="false"><path fill="currentColor" d="M80 0v32H0V0h80ZM69 2.2c-5.8 0-11.6 2-11.6 8.8 0 7.4 10.2 5.8 10.2 10 0 2.6-3.4 3-5.6 3-2.2 0-5-.6-6.4-1.4L54 28c2.2.8 5.4 1.4 8 1.4 6.2 0 12.8-1.8 12.8-9 0-7.8-10.2-6.6-10.2-10.2 0-2.2 2.2-2.6 5-2.6 2.6 0 4.4.6 5.8 1.2L77 3.4c-1.8-.8-4.8-1.2-8-1.2ZM16.6 3H7.8L2.2 29h6.6l3.6-18h.2L18 29h8.6l5.6-26h-6.6L22 21h-.2L16.6 3Zm25.2 0h-7.2l-5.2 26h6.8l2.4-11.2h8.2L44.6 29h7L57 3h-7l-2.2 9.8h-8l2-9.8Z"/></svg>`,
       },
       productName: 'Digital prevention services design history',
+      organisationName: "NHS Digital prevention services design history",
       search: {
         indexPath: '/search.json',
         sitemapPath: '/sitemap'