Document upload

* adds document upload form
* refactors modal form templates into form classes
* adds document upload route to intervention routes of urls.py

compensation/views.py

@@ -125,9 +125,9 @@ def new_payment_view(request: HttpRequest, intervention_id: str):
     Returns:
 
     """
-    template = "modal/modal_form.html"
     intervention = get_object_or_404(Intervention, id=intervention_id)
     form = NewPaymentForm(request.POST or None, instance=intervention, user=request.user)
+    template = form.template
     if request.method == "POST":
         if form.is_valid():
             payment = form.save()
@@ -163,9 +163,9 @@ def payment_remove_view(request: HttpRequest, id: str):
     Returns:
 
     """
-    template = "modal/modal_form.html"
     payment = get_object_or_404(Payment, id=id)
     form = RemoveModalForm(request.POST or None, instance=payment, user=request.user)
+    template = form.template
     if request.method == "POST":
         if form.is_valid():
             form.save()