Fix alignment of RSS nav link (#10)

Author: paracycle

source/layouts/layout.haml

@@ -21,7 +21,7 @@
           %li.nav-item
             = link_to 'Hardware', '/hardware.html', class: 'nav-link'
           %li.nav-item
-            = link_to 'RSS', '/feed.xml'
+            = link_to 'RSS', '/feed.xml', class: 'nav-link'
     .container-fluid.px-4
       = yield