Update page titles in index.*.html and SEO service

frontend/src/index.liquid.html

@@ -2,7 +2,7 @@
 <html lang="en">
 <head>
   <meta charset="utf-8">
-  <title>Liquid Explorer by mempool</title>
+  <title>mempool - Liquid Network</title>
   <base href="/">
 
   <meta name="description" content="An open-source explorer for the Liquid Network by mempool" />