Add 'Uploads' hub and navigation

The uploads hub is just a page with text for now - there are no actions
available on the page. It is linked to from a new 'Uploads' menu item on
the left of the page which is only visible if your service has the
`letter` and `upload_letters` permissions and if the current user has
permissions to send messages.

app/main/__init__.py

@@ -33,6 +33,7 @@ from app.main.views import (  # noqa isort:skip
     styleguide,
     templates,
     two_factor,
+    uploads,
     user_profile,
     verify,
 )

app/main/views/uploads.py

@@ -0,0 +1,10 @@
+from flask import render_template
+
+from app.main import main
+from app.utils import user_has_permissions
+
+
+@main.route("/services/<service_id>/uploads")
+@user_has_permissions('send_messages')
+def uploads(service_id):
+    return render_template('views/uploads/index.html')

app/navigation.py

@@ -300,6 +300,7 @@ class HeaderNavigation(Navigation):
         'template_history',
         'template_usage',
         'trial_mode',
+        'uploads',
         'usage',
         'view_job',
         'view_job_csv',
@@ -359,6 +360,9 @@ class MainNavigation(Navigation):
             'view_template_version',
             'view_template_versions',
         },
+        'uploads': {
+            'uploads',
+        },
         'team-members': {
             'confirm_edit_user_email',
             'confirm_edit_user_mobile_number',
@@ -844,6 +848,7 @@ class CaseworkNavigation(Navigation):
         'two_factor_email_sent',
         'update_email_branding',
         'update_letter_branding',
+        'uploads',
         'usage',
         'user_information',
         'user_profile',
@@ -1118,6 +1123,7 @@ class OrgNavigation(Navigation):
         'two_factor_email_sent',
         'update_email_branding',
         'update_letter_branding',
+        'uploads',
         'usage',
         'user_information',
         'user_profile',

app/templates/main_nav.html

@@ -14,6 +14,9 @@
         <li><a href="{{ url_for('.view_jobs', service_id=current_service.id) }}" {{ casework_navigation.is_selected('uploaded-files') }}>Uploaded files</a></li>
       {% endif %}
     {% endif %}
+  {% endif %}
+  {% if current_user.has_permissions('send_messages') and current_service.has_permission('letter') and current_service.has_permission('upload_letters') %}
+    <li><a href="{{ url_for('main.uploads', service_id=current_service.id) }}" {{ main_navigation.is_selected('uploads') }}>Uploads</a></li>
   {% endif %}
     <li><a href="{{ url_for('.manage_users', service_id=current_service.id) }}" {{ main_navigation.is_selected('team-members') }}>Team members</a></li>
   {% if current_user.has_permissions('manage_service', allow_org_user=True) %}

app/templates/views/uploads/index.html

@@ -0,0 +1,16 @@
+{% extends "withnav_template.html" %}
+{% from "components/page-header.html" import page_header %}
+
+{% block service_page_title %}
+  Uploads
+{% endblock %}
+
+{% block maincolumn_content %}
+<div class="grid-row">
+  <div class="column-two-thirds">
+    {{ page_header('Uploads') }}
+
+    <p>Upload a letter and Notify will print, pack and post it for you.</p>
+  </div>
+</div>
+{% endblock %}