feat(opensearch): add abilility to add libremdb as search engine

thanks to @user451421541757324

re https://github.com/zyachel/libremdb/issues/95

public/opensearch.xml

@@ -0,0 +1,7 @@
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/">
+  <ShortName>libremdb</ShortName>
+  <Description>Search libremdb</Description>
+  <InputEncoding>UTF-8</InputEncoding>
+  <Image width="16" height="16" type="image/x-icon">https://libremdb.iket.me/favicon.ico</Image>
+  <Url type="text/html" method="get" template="https://libremdb.iket.me/find?q={searchTerms}"/>
+</OpenSearchDescription>

src/components/meta/Meta.tsx

@@ -36,6 +36,13 @@ const Meta = ({
       <meta property='og:locale' content='en_US' />
       <meta property='og:type' content='video.movie' />
       <meta property='og:image' content={url.toString()} />
+
+      <link
+        rel='search'
+        type='application/opensearchdescription+xml'
+        href='/opensearch.xml'
+        title='libremdb'
+      ></link>
     </Head>
   );
 };