feat: display whether or not the instance is up to date on error (#310)

templates/error.html

@@ -6,10 +6,15 @@
 	<h1>{{ msg }}</h1>
 	<h3><a href="https://www.redditstatus.com/">Reddit Status</a></h3>
 	<br />
+	<h3 id="update-status"></h3>
+	<br>
+	<div id="git_commit" data-value="{{ crate::instance_info::INSTANCE_INFO.git_commit }}"></div>
+	<script src="/check_update.js"></script>
+	
 	<h3>Expected something to work? <a
 			href="https://github.com/redlib-org/redlib/issues/new?assignees=&labels=bug&projects=&template=bug_report.md&title=%F0%9F%90%9B+Bug+Report%3A+{{ msg }}">Report
 			an issue</a></h3>
 	<br />
 	<h3>Head back <a href="/">home</a>?</h3>
 </div>
-{% endblock %}
+{% endblock %}