Add item read page (#7)

- Open items links in an external window
- Include "Keep as New" button

src/public/index.php

@@ -24,14 +24,9 @@ page_head('Welcome'); ?>
 <h1>Your Unread Items</h1>
 <article><?php
 if ($item) {
-    while ($item) {
-        try {
-            $asOf = (new DateTimeImmutable($item['as_of']))->format(DATE_TIME_FORMAT);
-        } catch (Exception) {
-            $asOf = '(invalid date)';
-        } ?>
-        <p><a href=/item/view?id=<?=$item['id']?>><?=htmlentities($item['item_title'])?></a><br>
-            <?=htmlentities($item['feed_title'])?><br><small><em><?=$asOf?></em></small><?php
+    while ($item) { ?>
+        <p><a href=/item?id=<?=$item['id']?>><?=htmlentities($item['item_title'])?></a><br>
+            <?=htmlentities($item['feed_title'])?><br><small><em><?=date_time($item['as_of'])?></em></small><?php
         $item = $result->fetchArray(SQLITE3_ASSOC);
     }
 } else { ?>