big commit with letters removal

app/templates/partials/check/letter-too-long.html

@@ -1,8 +0,0 @@
-<h1 h1 class="banner-title" data-module="track-error" data-error-type="letter-too-long" data-error-label="precompiled letter validation failed for service_id: {{ current_service.id }}">
-  Your letter is too long
-</h1>
-<p class="govuk-body">
-  Letters must be {{ letter_max_pages }} pages or less ({{ letter_max_pages // 2 }} double-sided sheets of paper).
-  <br>
-  Your letter is {{ page_count }} pages long.
-</p>

app/templates/partials/check/letter-validation-failed-banner.html

@@ -1,18 +0,0 @@
-{% from "components/banner.html" import banner_wrapper %}
-
-{% call banner_wrapper(type='dangerous') %}
-  {% if message is string %}
-    <h1 class="banner-title">
-      {{ message }}
-    </h1>
-  {% else %}
-    <h1 class="banner-title" data-module="track-error" data-error-type="{{ error_code }}" data-error-label="precompiled letter validation failed for service_id: {{ current_service.id }}">
-      {{ message.title }}
-    </h1>
-    {% if message.detail %}
-      <p class="govuk-body">
-        {{ message.detail | safe }}
-      </p>
-    {% endif %}
-  {% endif %}
-{% endcall %}

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

@@ -1,8 +0,0 @@
-<h1 class='banner-title' data-module="track-error" data-error-type="Trying to send letters in trial mode" data-error-label="{{ upload_id }}">
-  You cannot send
-  {{ 'this letter' if count_of_recipients == 1 else 'these letters' }}
-</h1>
-<p class="govuk-body">
-  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>