Fine tune logo on header, tweak landing message

Author: darribas

_includes/header.html

@@ -8,7 +8,7 @@
     <a class="site-title" rel="author" href="{{ "/" | relative_url }}">{{ site.title | escape }}</a>
     --->
     <a class="site-title" rel="author" href="{{ "/" | relative_url }}">
-        <img src="https://github.com/gdsbook/book/raw/master/infrastructure/booksite/logo/ico_64x64.png" alt="GDS Book Logo" />
+        <img src="https://github.com/gdsbook/book/raw/master/infrastructure/booksite/logo/ico_32x32.png" alt="GDS Book Logo" />
     </a>
 
     {%- if titles_size > 0 -%}

index.md

@@ -8,8 +8,10 @@
 layout: home
 ---
 
-This the site for the book *"Geographic Data Science with PySAL and PyData
-Stack"*, by Sergio J. Rey, Dani Arribas-Bel and Levi J. Wolf. Find out about
+# *{{site.title}}*
+
+This is the site for the book *"Geographic Data Science with PySAL and PyData
+Stack"*, by Sergio J. Rey, Dani Arribas-Bel and Levi J. Wolf. Here you can find out about
 the latest news regarding the book, 
-[read more about the authors](/authors), or jump straight to the
+read more about the [authors](/authors), or jump straight to the
 [book](http://geographicdata.science/book).