Page one pagination should link to "/" not "/?p=1"

lib/nunjucks-filters.js

@@ -50,8 +50,12 @@ const filters = {
       query.p--;
     }
 
+    // Don't add p var if it's page 1
+    query.p == 1 && delete query.p
+
     // Encode query string
-    return `/?${querystring.encode(query)}`;
+    const queryString = querystring.encode(query);
+    return queryString ? `/?${queryString}` : '/';
   },
   name: node => node.nickname
     || node.fingerprint && node.fingerprint.slice(0, 8)