Add search index (#15)

- Add utility rebuild script
- Add Search to header
- Add shell of search page
- Add search query support to ItemList

src/lib/ItemList.php

@@ -134,6 +134,22 @@ class ItemList {
             "/feed/items?id=$feedId&bookmarked");
     }
 
+    /**
+     * Create an item list with items matching given search terms
+     *
+     * @param string $search The item search terms / query
+     * @param SQLite3 $db The database connection to use to obtain items
+     * @return static An item list match the given search terms
+     */
+    public static function matchingSearch(string $search, SQLite3 $db): static {
+        $list = new static($db,
+            self::makeQuery($db, ['item.id IN (SELECT ROWID FROM item_search WHERE content MATCH :search)'],
+                [[':search', $search]]), 'Matching', "/search?search=$search");
+        $list->showIndicators = true;
+        $list->displayFeed    = true;
+        return $list;
+    }
+
     /**
      * Render this item list
      */