Add OpenSearch and Google site search support

app/public/static/opensearch.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
+	<ShortName>ContentDB</ShortName>
+	<LongName>ContentDB</LongName>
+	<InputEncoding>UTF-8</InputEncoding>
+	<Description>Search mods, games, and textures for Minetest.</Description>
+	<Tags>Minetest Mod Game Subgame Search</Tags>
+	<Url type="text/html" method="get" template="https://content.minetest.net/packages?q={searchTerms}"/>
+</OpenSearchDescription>

app/templates/base.html

@@ -8,6 +8,7 @@
 	<title>{% block title %}title{% endblock %} - {{ config.USER_APP_NAME }}</title>
 	<link rel="stylesheet" type="text/css" href="/static/bootstrap.css">
 	<link rel="stylesheet" type="text/css" href="/static/custom.css?v=6">
+	<link rel="search" type="application/opensearchdescription+xml" href="/static/opensearch.xml" title="ContentDB" />
 	{% block headextra %}{% endblock %}
 </head>
 

app/templates/index.html

@@ -4,6 +4,21 @@
 Welcome
 {% endblock %}
 
+{% block scriptextra %}
+<script type="application/ld+json">
+{
+  "@context": "https://schema.org",
+  "@type": "WebSite",
+  "url": "https://content.minetest.net/",
+  "potentialAction": {
+    "@type": "SearchAction",
+    "target": "https://content.minetest.net/packages?q={search_term_string}",
+    "query-input": "required name=search_term_string"
+  }
+}
+</script>
+{% endblock %}
+
 {% block content %}
 <!-- <header class="jumbotron">
 	<div class="container">