Update all links to use GOVUK Frontend style

Includes:
- turning off :visited styles to match existing
  design
- swapping heading classes used to make links bold
  for the GOVUK Frontend bold override class
- adding visually hidden text to some links to
  make them work when isolated from their context

We may need to revisit whether some links, such as
those for documentation and features, may benefit
from having some indication that their target has
been visited.

app/templates/views/features/emails.html

@@ -10,7 +10,7 @@
   <h1 class="heading heading-large">Emails</h1>
   <p>Send an unlimited number of emails for free with GOV.UK Notify.</p>
   {% if not current_user.is_authenticated %}
-    <p><a href="{{ url_for('main.register') }}">Create an account</a> and try Notify for yourself.</p>
+    <p><a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('main.register') }}">Create an account</a> and try Notify for yourself.</p>
   {% endif %}
 
   <h2 class="heading heading-medium">Features</h2>
@@ -20,7 +20,7 @@
     <li>personalise the content of your emails</li>
     <li>send and schedule bulk messages</li>
   </ul>
-  <p>You can also <a href="{{ url_for('.documentation') }}">integrate with our API</a> to send emails automatically.</p>
+  <p>You can also <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.documentation') }}">integrate with our API</a> to send emails automatically.</p>
 
   <h3 class="heading heading-small" id="branding">Email branding</h3>
   <p>Add your organisation’s logo and brand colour to email templates.</p>
@@ -35,8 +35,8 @@
     <!--<li>you can track when the recipient downloads your document</li>-->
     <li>email attachments are often marked as spam</li>
   </ul>
-  <p><a href="{{ url_for('.feedback', ticket_type='ask-question-give-feedback') }}">Contact us</a> if you want to send files by email.</p>
-  <p>Read our <a href="{{ url_for('.documentation') }}">API documentation</a> for more information.</p>
+  <p><a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.feedback', ticket_type='ask-question-give-feedback') }}">Contact us</a> if you want to send files by email.</p>
+  <p>Read our <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.documentation') }}">API documentation</a> for more information.</p>
 
   <h3 class="heading heading-small" id="reply-to">Add a reply-to address</h3>
   <p>Notify lets you choose the email address that users reply to.</p>
@@ -45,6 +45,6 @@
 
   <h2 class="heading heading-medium">Pricing</h2>
   <p>It’s free to send emails through Notify.</p>
-  <p><a href="{{ url_for('.pricing') }}">See pricing</a> for more details.</p>
+  <p><a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.pricing') }}">See pricing</a> for more details.</p>
 
 {% endblock %}

app/templates/views/features/letters.html

@@ -10,7 +10,7 @@
   <h1 class="heading heading-large">Letters</h1>
   <p>GOV.UK Notify will print, pack and post your letters for you.</p>
   {% if not current_user.is_authenticated %}
-    <p><a href="{{ url_for('main.register') }}">Create an account</a> and try Notify for yourself.</p>
+    <p><a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('main.register') }}">Create an account</a> and try Notify for yourself.</p>
   {% endif %}
 
   <h2 class="heading heading-medium">Features</h2>
@@ -20,7 +20,7 @@
     <li>personalise the content of your letter</li>
     <li>send bulk mail</li>
   </ul>
-  <p>You can also <a href="{{ url_for('.documentation') }}">integrate with our API</a> to send letters automatically.</p>
+  <p>You can also <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.documentation') }}">integrate with our API</a> to send letters automatically.</p>
 
   <h3 class="heading-small" id="postage">Choose your postage</h3>
   <p>Notify can send letters by first or second class post.</p>
@@ -33,7 +33,7 @@
 
   <h3 class="heading heading-small" id="upload-letters">Upload your own letters</h3>
   <p>You can create reusable letter templates in Notify, or upload and send your own letters with the Notify API.</p>
-  <p>Read our <a href="{{ url_for('.documentation') }}">documentation</a>.</p>
+  <p>Read our <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.documentation') }}">documentation</a>.</p>
 
   <h2 class="heading heading-medium">Pricing</h2>
   <p>It costs between 30p and 76p (plus VAT) to send a letter. Prices include:</p>
@@ -44,6 +44,6 @@
      <li>first or second class postage</li>
   </ul>
   <p>Letters can be up to 10 pages long (5 double-sided sheets of paper).</p>
-  <p><a href="{{ url_for('.pricing') }}">See pricing</a> for more details.</p>
+  <p><a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.pricing') }}">See pricing</a> for more details.</p>
 
 {% endblock %}

app/templates/views/features/text-messages.html

@@ -10,7 +10,7 @@
   <h1 class="heading heading-large">Text messages</h1>
   <p>Send thousands of free text messages to UK and international numbers with GOV.UK Notify.</p>
   {% if not current_user.is_authenticated %}
-  <p><a href="{{ url_for('main.register') }}">Create an account</a> and try Notify for yourself.</p>
+  <p><a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('main.register') }}">Create an account</a> and try Notify for yourself.</p>
   {% endif %}
 
   <h2 class="heading heading-medium">Features</h2>
@@ -19,12 +19,12 @@
     <li>create reusable text message templates</li>
     <li>personalise the content of your texts</li>
     <li>send and schedule bulk messages</li></ul>
-  <p>You can also <a href="{{ url_for('.documentation') }}">integrate with our API</a> to send text messages automatically.<p>
+  <p>You can also <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.documentation') }}">integrate with our API</a> to send text messages automatically.<p>
 
   <h3 class="heading heading-small" id="receive">Receive text messages</h3>
   <p>Let people send messages to your service or reply to your texts.</p>
   <p>You can see and reply to the messages you receive when you sign in to Notify. If you’re using our API, you can set up your own automated processes to manage replies.</p>
-  <p><a href="{{ url_for('.feedback', ticket_type='ask-question-give-feedback') }}">Contact us</a> to request a unique number for text message replies.</p>
+  <p><a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.feedback', ticket_type='ask-question-give-feedback') }}">Contact us</a> to request a unique number for text message replies.</p>
 
   <h3 class="heading heading-small" id="sender">Show people who your texts are from</h3>
   <p>When you send a text message with Notify, the sender name tells people who it's from.</p>
@@ -36,6 +36,6 @@
     <ul class="list list-bullet">
       <li>250,000 free text messages for central government services</li>
       <li>25,000 free text messages for other public sector services</li></ul>
-    <p><a href="{{ url_for('.pricing') }}">See pricing</a> for more details.</p>
+    <p><a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.pricing') }}">See pricing</a> for more details.</p>
 
 {% endblock %}