Update intro for eBook CTA

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Author: alexellis

_includes/landing-page/landing-book.html

@@ -4,10 +4,10 @@
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                     <h1 class="title is-size-4 is-size-3-desktop has-text-grey-darker">
-                        Get Alex's new book: Serverless For Everyone Else
+                       Understand the value of Serverless
                     </h1>
                     <h1 class="title has-text-weight-light is-size-4 is-size-4-desktop has-text-grey">
-                        Alex's new eBook is the official handbook for faasd. You'll learn how to deploy open-source serverless and start writing functions and CRUD APIs in Node.js with Postgresql.
+                        In <i>Serverless For Everyone Else</i>, you'll gain a working knowledge of the value and use-cases of serverless functions. You'll then build your own with Node.js and learn how to secure and monitor them.
                     </h1>
                 </div>
                 <a href="https://gumroad.com/l/serverless-for-everyone-else" target="_top" class="button is-primary is-large">