convert index to mako template

backend/setup.py

     'lxml',
     'redis',
     'rq',
+    # frontend file serve
+    'pyramid_mako',
 ]
 
 tests_require = [

backend/tracim_backend/__init__.py

     configurator.include(file_controller.bind, route_prefix=BASE_API_V2)
 
     if app_config.FRONTEND_SERVE:
+        configurator.include('pyramid_mako')
         frontend_controller = FrontendController(app_config.FRONTEND_DIST_FOLDER_PATH)  # nopep8
         configurator.include(frontend_controller.bind)
 

backend/tracim_backend/views/frontend.py

 import os
 
-from pyramid.response import Response
+from pyramid.renderers import render_to_response
 from pyramid.config import Configurator
 from tracim_backend.exceptions import PageNotFound
 from tracim_backend.views import BASE_API_V2
 from tracim_backend.lib.utils.request import TracimRequest
 from tracim_backend.views.controllers import Controller
 
-INDEX_PAGE_NAME = 'index.html'
+INDEX_PAGE_NAME = 'index.mak'
 
 
 class FrontendController(Controller):
     def __init__(self, dist_folder_path: str):
         self.dist_folder_path = dist_folder_path
 
+    def _get_index_file_path(self):
+        index_file_path = os.path.join(self.dist_folder_path, INDEX_PAGE_NAME)
+        if not os.path.exists(index_file_path):
+            raise FileNotFoundError()
+        return index_file_path
+
     def not_found_view(self, context, request: TracimRequest):
 
         if request.path.startswith(BASE_API_V2):
-            raise PageNotFound('{} is not a valid path'.format(request.path)) from context
+            raise PageNotFound('{} is not a valid path'.format(request.path)) from context # nopep8
         return self.index(context, request)
 
     def index(self, context, request: TracimRequest):
-        index_file_path = os.path.join(self.dist_folder_path, INDEX_PAGE_NAME)
-        if not os.path.exists(index_file_path):
-            raise FileNotFoundError()
-        with open(index_file_path) as file:
-            return Response(
-                content_type='text/html',
-                body=file.read()
-            )
+        return render_to_response(
+            self._get_index_file_path(),
+            {}
+        )
 
     def bind(self, configurator: Configurator) -> None: