Update site title.

doc/user/preface.xml

@@ -8,8 +8,9 @@
 <section xml:id="tarantool-overview">
   <title>Tarantool: an overview</title>
   <para>
-    <productname>Tarantool</productname> is an in-memory NoSQL
-    database management system. The code is available for free under the terms of the
+    <productname>Tarantool</productname> is a NoSQL
+    database management system running in a Lua application
+    server. The code is available for free under the terms of the
     <citetitle
     xlink:href="http://www.gnu.org/licenses/license-list.html#ModifiedBSD">BSD
     license</citetitle>. Supported platforms are GNU/Linux, Mac OS

doc/www-data.in/_layout/index

 {% extends "base" %}
-{% set title = "Tarantool -- an in-memory NoSQL database" %}
+{% set title = "Tarantool -- a NoSQL database in a Lua script" %}
 {% block content %}
     {{ index.main }}
 {% endblock content %}

doc/www-data.in/_text/intro.md

@@ -2,7 +2,8 @@ intro:
     main: |
         ## What is Tarantool?
 
-        Tarantool is an in-memory NoSQL database. The code is available
+        Tarantool is a NoSQL database running and a Lua application server.
+        The code is available
         for free under the terms of [BSD license]. Supported platforms
         are GNU/Linux, Mac OS and FreeBSD.