docs(plugin configuration): add metadata to plugin configuration to b…

…e consumed on plugin pages (#506)

* docs(plugin configuration): add metadata to plugin configuration to be consumed on plugin pages

* docs: update documentation url

Point to rendered documentation, not to repo

---------

Co-authored-by: Greg Tyler <gregtyler@users.noreply.github.com>

package/govuk-prototype-kit.config.json

@@ -1,4 +1,12 @@
 {
+  "meta": {
+    "description": "The MOJ Frontend contains the code you need to start building user interfaces for UK Ministry of Justice government services.",
+    "urls": {
+      "documentation": "https://design-patterns.service.justice.gov.uk/",
+      "releaseNotes": "https://github.com/ministryofjustice/moj-frontend/releases/tag/v{{version}}",
+      "versionHistory": "https://github.com/ministryofjustice/moj-frontend/releases"
+    }
+  },
   "nunjucksFilters": [
     "/moj/filters/prototype-kit-13-filters.js"
   ],