Revert "Remove keyboard shortcut panel"

This reverts commit f171d5522ba72f607b3fede1e42d4185c7000ca0.

web/templates/admin/panel.html

@@ -2,6 +2,9 @@
 <a href="#" class="to-top">
 	<i class="fas fa-arrow-up"></i>
 </a>
+<a href="#" class="to-shortcuts">
+	<i class="fas fa-keyboard"></i>
+</a>
 
 <div class="l-header">
 	<div class="l-center">

web/templates/user/panel.html

@@ -2,6 +2,9 @@
 <a href="#" class="to-top">
 	<i class="fas fa-arrow-up"></i>
 </a>
+<a href="#" class="to-shortcuts">
+	<i class="fas fa-keyboard"></i>
+</a>
 
 <div class="l-header">
 	<div class="l-center">