Support opensearch, close #5

Author: Folyd

Diff for: src/app.html

@@ -22,6 +22,7 @@
     <meta name="twitter:card" content="summary_large_image">
     <meta property="og:image" content="https://query.rs/og.png">
     <meta name="twitter:image" content="https://query.rs/og.png">
+    <link rel="search" href="/opensearch.xml" type="application/opensearchdescription+xml" title="Query.rs" />
     <link rel='stylesheet' href='%sveltekit.assets%/css/balloon.min.css'>
     <link href="https://fonts.googleapis.com/css?family=Fira+Sans:400,500,600&display=swap" rel="stylesheet">
     <style>

Diff for: static/assets/logo64.png

@@ -0,0 +1,6 @@
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
+  <ShortName>Query.rs</ShortName>
+  <Description>A search engine for Rust.</Description>
+  <Image width="16" height="16" type="image/x-icon">https://query.rs/favicon.ico</Image>
+  <Url type="text/html" method="get" template="https://query.rs?q={searchTerms}"/>
+</OpenSearchDescription>