♻️(backend) refactor post hackathon to a first working version

This project was copied and hacked to make a POC in a 2-day hackathon.
We need to clean and refactor things in order to get a first version
of the product we want.

src/backend/core/urls.py

@@ -1,10 +1,36 @@
 """URL configuration for the core app."""
-from django.urls import path
+from django.conf import settings
+from django.urls import include, path, re_path
+
+from rest_framework.routers import DefaultRouter
+
+from core.api import viewsets
+
+# - Main endpoints
+router = DefaultRouter()
+router.register("templates", viewsets.TemplateViewSet, basename="templates")
+router.register("users", viewsets.UserViewSet, basename="users")
+
+# - Routes nested under a template
+template_related_router = DefaultRouter()
+template_related_router.register(
+    "accesses",
+    viewsets.TemplateAccessViewSet,
+    basename="template_accesses",
+)
 
-from core.views import generate_document, TemplatesApiView, GenerateDocumentAPIView
 
 urlpatterns = [
-    path('generate-document/', generate_document, name='generate_document'),
-    path('api/generate-document/', GenerateDocumentAPIView.as_view(), name='generate-document'),
-    path('api/templates', TemplatesApiView.as_view()),
+    path(
+        f"api/{settings.API_VERSION}/",
+        include(
+            [
+                *router.urls,
+                re_path(
+                    r"^templates/(?P<template_id>[0-9a-z-]*)/",
+                    include(template_related_router.urls),
+                ),
+            ]
+        ),
+    ),
 ]