Add user maintenance CLI (#9)

- Add CLI infrastructure
- Add user to index page query
- Strip tags from title
- Move item parsing to FeedItem

src/public/item.php

@@ -53,7 +53,7 @@ $updated   = isset($item['updated_on']) ? date_time($item['updated_on']) : null;
 
 page_head(htmlentities("{$item['item_title']} | {$item['feed_title']}")); ?>
 <h1 class=item_heading>
-    <a href="<?=$item['item_link']?>" target=_blank rel=noopener><?=$item['item_title']?></a><br>
+    <a href="<?=$item['item_link']?>" target=_blank rel=noopener><?=strip_tags($item['item_title'])?></a><br>
 </h1>
 <div class=item_published>
     From <strong><?=htmlentities($item['feed_title'])?></strong><br>