Signpost Wikidata on the homepage

Most of the changes required for everypolitician/everypolitician-docs#43
(Rewrite docs in light of Wikidata-first approach) need to happen in the
`everypolitician-docs` repo, but we also need to highlight the Wikidata
connection better from here too.

We will probably want to take this further / make this clearer here once
we've actually written the rest of those docs, but we need to do
*something* now, as it still looks as if our goal here is to do all this
ourselves.

views/homepage.erb

@@ -9,16 +9,15 @@
 
 <div class="page-section page-section--grey">
     <div class="container homepage-data-example">
-        <h2>The world’s richest open dataset on politicians</h2>
-        <p><strong title="<%= commify(@page.total_statements) %> to be precise"><%= number_to_millions(@page.total_statements) %> million</strong> pieces of data so far.</p>
+      <h2>Making <a href="https://www.wikidata.org/">Wikidata</a> the world’s richest open dataset on politicians</h2>
     </div>
 </div>
 
 <div class="page-section">
     <div class="container row">
         <div class="column-two-thirds">
-            <h3>What is EveryPolitician?</h3>
-            <p>Data about every national legislature in the world, freely available for you to use:</p>
+            <h3>What is in EveryPolitician?</h3>
+            <p>Simplified data about every national legislature in the world, freely available for you to use:</p>
             <a href="http://docs.everypolitician.org/" class="button button--small">Read more…</a>
         </div>
         <div class="column-one-third">

views/layout.erb

@@ -95,7 +95,7 @@
             <div class="column-five-twelfths">
                 <h2 class="mysoc-footer__site-name">EveryPolitician</h2>
                 <div class="mysoc-footer__site-description">
-                    <p>A simple but ambitious project to collect and share data about every politician in every country in the world, in a consistent, open format that anyone can use.</p>
+                  <p>A simple but ambitious project to ensure data about every politician in every country in the world, is available in a consistent, open format that anyone can use.</p>
                 </div>
             </div>