Only rename app title, data model is unchanged

Renam mensa to resint and menu to poster, make initial migrations

aleksis/apps/mensa/migrations/0002_extensible_model_as_default.py

-# Generated by Django 3.0.3 on 2020-02-25 15:40
-
-import django.contrib.postgres.fields.jsonb
-from django.db import migrations
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('mensa', '0001_initial'),
-    ]
-
-    operations = [
-        migrations.AddField(
-            model_name='menu',
-            name='extended_data',
-            field=django.contrib.postgres.fields.jsonb.JSONField(default=dict, editable=False),
-        ),
-    ]