Remove placeholder letters page

👋 emoji

app/main/__init__.py

@@ -26,6 +26,5 @@ from app.main.views import (
     invites,
     feedback,
     providers,
-    platform_admin,
-    letters
+    platform_admin
 )

app/main/views/letters.py

@@ -1,14 +0,0 @@
-from flask import render_template, abort
-from flask_login import login_required
-
-from app import current_service
-from app.main import main
-from app.utils import user_has_permissions
-
-
-@main.route("/services/<service_id>/letters")
-@login_required
-def letters(service_id):
-    if not current_service['can_send_letters']:
-        abort(403)
-    return render_template('views/letters.html')