Remove the link to the original design principles

As this is now out-of-date.

Also trim trailing whitespace.

app/views/root/designprinciples.html.erb

@@ -3,7 +3,7 @@
  <div id="wrapper" class="design-principles">
   <header class="gds-principles">
     <h1>Government Digital Service <strong>Design Principles</strong></h1>
-    <p>Listed below are our design principles and examples of how we’ve used them so far. These build on, and add to, our original <a href="http://www.flickr.com/photos/benterrett/7041509709/">7 digital principles</a>.</p>
+    <p>Listed below are our design principles and examples of how we’ve used them so far.</p>
   </header>
    <nav>
      <ol>
@@ -39,7 +39,7 @@
        </li>
      </ol>
    </nav>
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    <ol class="principles">
      <li class="principle">
       <article>
@@ -63,12 +63,12 @@
          </div>
         </article>
      </li>
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      <li class="principle">
        <article>
-       
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          <h1 id="second">Do less</h1>
-       
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          <div class="outline">
            <p>
             Government should only do what only government can do. If we’ve
@@ -86,12 +86,12 @@
          </div>
        </article>
      </li>
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      <li class="principle">
        <article>
-       
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          <h1 id="third">Design with data</h1>
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          <div class="outline">
            <p>
             In most cases, we can learn from real world behaviour by looking at
@@ -109,12 +109,12 @@
          </div>
        </article>
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      <li class="principle">
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          <h1 id="fourth">Do the hard work to make it simple</h1>
-       
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          <div class="outline">
            <p>
             Making something look simple is easy. Making something simple to
@@ -131,12 +131,12 @@
          </div>
        </article>
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          <h1 id="fifth">Iterate. Then iterate again.</h1>
-       
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          <div class="outline">
            <p>
             The best way to build good services is to start small and iterate
@@ -162,12 +162,12 @@
          </div>
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          <h1 id="sixth">This is for everyone</h1>
-       
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          <div class="outline">
            <p>
             Accessible design is good design. Everything we build should be as
@@ -183,12 +183,12 @@
              <li><a href="https://accessibility.blog.gov.uk/2016/05/16/consider-the-range-of-people-that-will-use-your-product-or-service/">Consider the range of people that will use your product or service</a>, by&nbsp;Alistair&nbsp;Duggin</li>
              <li><a href="https://accessibility.blog.gov.uk/2016/05/17/hope-inspiration-and-inclusion/">Hope, inspiration and inclusion</a>, by&nbsp;Steven&nbsp;Mark</li>
              <li><a href="https://gds.blog.gov.uk/2012/10/01/building-for-inclusion/">Building for inclusion</a>, by&nbsp;Léonie&nbsp;Watson</li>
-             
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            </ul>
          </div>
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        <article>
          <h1 id="seventh">Understand context</h1>
@@ -207,12 +207,12 @@
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          <h1 id="eighth">Build digital services, not websites</h1>
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          <div class="outline">
            <p>
             A service is something that helps people to do something. Our job
@@ -230,12 +230,12 @@
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          <h1 id="ninth">Be consistent, not uniform</h1>
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          <div class="outline">
            <p>
             We should use the same language and the same design patterns
@@ -257,7 +257,7 @@
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