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/partials/check/not-allowed-to-send-to.html

@@ -7,6 +7,6 @@
   {%- endif %}
 </h1>
 <p>
-  In <a href="{{ url_for('.trial_mode_new') }}">trial mode</a> you can only
+  In <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.trial_mode_new') }}">trial mode</a> you can only
   send to yourself and members of your team
 </p>

app/templates/partials/check/too-many-messages.html

@@ -8,7 +8,7 @@
 <p>
   You can only send {{ current_service.message_limit }} messages per day
   {%- if current_service.trial_mode %}
-    in <a href="{{ url_for('.trial_mode_new')}}">trial mode</a>
+    in <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.trial_mode_new')}}">trial mode</a>
   {%- endif -%}
   .
 </p>

app/templates/partials/check/trying-to-send-letters-in-trial-mode.html

@@ -3,6 +3,6 @@
   {{ 'this letter' if count_of_recipients == 1 else 'these letters' }}
 </h1>
 <p>
-  In <a href="{{ url_for('.trial_mode_new') }}">trial mode</a> you
+  In <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.trial_mode_new') }}">trial mode</a> you
   can only preview how your letters will look
 </p>

app/templates/partials/jobs/notifications.html

@@ -7,7 +7,7 @@
 
     <p>
       Sending
-      <a href="{{ url_for('.view_template_version', service_id=current_service.id, template_id=job.template.id, version=job.template_version) }}">{{ job.template.name }}</a>
+      <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.view_template_version', service_id=current_service.id, template_id=job.template.id, version=job.template_version) }}">{{ job.template.name }}</a>
       {{ job.scheduled_for|format_datetime_relative }}
     </p>
     <div class="page-footer">
@@ -34,7 +34,7 @@
           </p>
         {% elif notifications %}
           <p class="{% if job.template.template_type != 'letter' %}bottom-gutter{% endif %}">
-            <a href="{{ download_link }}" download class="heading-small">Download this report</a>
+            <a href="{{ download_link }}" download class="govuk-link govuk-link--no-visited-state heading-small">Download this report</a>
             &emsp;
             <span id="time-left">{{ time_left }}</span>
           </p>
@@ -55,7 +55,7 @@
         field_headings_visible=False
       ) %}
         {% call row_heading() %}
-          <a class="file-list-filename" href="{{ url_for('.view_notification', service_id=current_service.id, notification_id=item.id, from_job=job.id) }}">{{ item.to }}</a>
+          <a class="govuk-link govuk-link--no-visited-state file-list-filename" href="{{ url_for('.view_notification', service_id=current_service.id, notification_id=item.id, from_job=job.id) }}">{{ item.to }}</a>
           <p class="file-list-hint">
             {{ item.preview_of_content }}
           </p>

app/templates/partials/notifications/status.html

@@ -1,7 +1,7 @@
 <div class="ajax-block-container">
   <p class="notification-status {{ notification.status|format_notification_status_as_field_status(notification.notification_type) }}">
     {% if notification.status|format_notification_status_as_url(notification.notification_type) %}
-      <a href="{{ notification.status|format_notification_status_as_url(notification.notification_type) }}">
+      <a class="govuk-link govuk-link--no-visited-state" href="{{ notification.status|format_notification_status_as_url(notification.notification_type) }}">
     {% endif %}
     {{ notification.status|format_notification_status(
       notification.template.template_type

app/templates/partials/templates/guidance-character-count.html

@@ -4,5 +4,5 @@
   cost more.
 </p>
 <p>
-  See <a href="{{ url_for('.pricing') }}">pricing</a> for details.
+  See <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.pricing') }}">pricing</a> for details.
 </p>

app/templates/partials/templates/guidance-postage.html

@@ -11,5 +11,5 @@
   Royal Mail delivers from Monday to Saturday, excluding bank holidays.
 </p>
 <p>
-  See a list of <a href="{{ url_for('.pricing') + '#letters'}}">postage prices</a>.
+  See a list of <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('.pricing') + '#letters'}}">postage prices</a>.
 </p>

app/templates/partials/templates/guidance-send-a-document.html

@@ -9,4 +9,4 @@
     Download your document at: ((link_to_document))
   </p>
 </div>
-  Next, use the API to upload your document. Follow the instructions to send a document by email in the <a href="{{ url_for('main.documentation') }}">API documentation</a>.
+  Next, use the API to upload your document. Follow the instructions to send a document by email in the <a class="govuk-link govuk-link--no-visited-state" href="{{ url_for('main.documentation') }}">API documentation</a>.

app/templates/partials/tour.html

@@ -31,7 +31,7 @@
           Notify delivers the message
         </p>
         {% if help == '3' %}
-          <a href='{{ url_for(".go_to_dashboard_after_tour", service_id=current_service.id, example_template_id=template.id) }}'>
+          <a class="govuk-link govuk-link--no-visited-state" href='{{ url_for(".go_to_dashboard_after_tour", service_id=current_service.id, example_template_id=template.id) }}'>
             Now go to your dashboard
           </a>
         {% endif %}