portal: allow list destruction

fixes #15

app/portal/util.py

@@ -1,8 +1,9 @@
 from flask import Response, render_template, flash, redirect, url_for
+from flask_wtf import FlaskForm
+from wtforms import SubmitField
 
 from app import db
 from app.models import AbstractResource
-from app.portal.forms import LifecycleForm
 
 
 def response_404(message: str):
@@ -44,3 +45,7 @@ def view_lifecycle(*,
                            message=message,
                            section=section,
                            form=form)
+
+
+class LifecycleForm(FlaskForm):
+    submit = SubmitField('Confirm')