BUGFIX: Limit search to document nodeTypes

The SearchPlugin outputs all kinds of nodeTypes (e.g. ContentCollections)
in the search results. Content nodeTypes have no URL and therefore are not
linkable.

By limiting the `searchQuery` to only include `TYPO3.Neos:Document`
nodeTypes we ensure all search results are linkable and no internal
elements (like "contentRight", "sidebar") are included.

Author: jrenggli

Resources/Private/TypoScript/SearchPlugin.ts2

@@ -2,7 +2,7 @@ prototype(Flowpack.SearchPlugin:Search) < prototype(TYPO3.Neos:Content) {
     templatePath = 'resource://Flowpack.SearchPlugin/Private/Templates/NodeTypes/Search.html'
 
     searchTerm = ${request.arguments.search}
-    searchQuery = ${this.searchTerm ? Search.query(site).fulltext(this.searchTerm) : null}
+    searchQuery = ${this.searchTerm ? Search.query(site).fulltext(this.searchTerm).nodeType('TYPO3.Neos:Document') : null}
 
     totalSearchResults = ${this.searchQuery.count()}