fix: add opensearch

Author: remy

public/_data.json

@@ -2,6 +2,9 @@
   "feed.xml": {
     "layout": false
   },
+  "opensearch.xml": {
+    "layout": false
+  },
   "tia": {
     "layout": false
   },

public/_partials/layout.jade

@@ -45,6 +45,8 @@ else
       meta(name="HandheldFriendly" content="True")
       meta(name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1")
       meta(name="theme-color" content="#1A1A1A")
+      link(rel="search" type="application/opensearchdescription+xml" href="/opensearch.xml" title="Remy Sharp's b:log")
+
 
       block meta
       block ampalt