Remove Sizewell from the demo areas library

We added this for the 25 May demo. We’re unlikely to need it again.

We’re also unlikely to need this library again, so this commit removes
the source and the code that creates it.

app/broadcast_areas/create-broadcast-areas-db.py

@@ -187,7 +187,6 @@ def estimate_number_of_smartphones_in_area(country_or_ward_code):
 
 
 test_filepath = source_files_path / "Test.geojson"
-demo_filepath = source_files_path / "Demo.geojson"
 ctry19_filepath = source_files_path / "Countries.geojson"
 
 # https://geoportal.statistics.gov.uk/datasets/wards-may-2020-boundaries-uk-bgc
@@ -282,42 +281,6 @@ def add_test_areas():
     repo.insert_broadcast_areas(areas_to_add, keep_old_polygons)
 
 
-def add_demo_areas():
-    dataset_id = 'demo'
-    dataset_geojson = geojson.loads(demo_filepath.read_text())
-    repo.insert_broadcast_area_library(
-        dataset_id,
-        name='Demo areas',
-        name_singular='demo area',
-        is_group=False,
-    )
-
-    areas_to_add = []
-    for feature in dataset_geojson["features"]:
-        f_id = feature["properties"]['id']
-        f_name = feature["properties"]['name']
-        f_count_of_phones = feature["properties"]['count_of_phones']
-
-        print()  # noqa: T001
-        print(f_name)  # noqa: T001
-
-        feature, _, utm_crs = polygons_and_simplified_polygons(
-            feature["geometry"]
-        )
-
-        print('    Phones: ', f_count_of_phones)  # noqa: T001
-
-        areas_to_add.append([
-            f'{dataset_id}-{f_id}', f_name,
-            dataset_id, None,
-            feature, feature,
-            utm_crs,
-            f_count_of_phones,
-        ])
-
-    repo.insert_broadcast_areas(areas_to_add, keep_old_polygons)
-
-
 def add_countries():
     dataset_id = 'ctry19'
     dataset_geojson = geojson.loads(ctry19_filepath.read_text())
@@ -471,7 +434,6 @@ else:
     repo.delete_db()
     repo.create_tables()
 add_test_areas()
-add_demo_areas()
 add_countries()
 add_wards_local_authorities_and_counties()
 

app/broadcast_areas/source_files/Demo.geojson

@@ -1,24 +0,0 @@
-{
-  "type": "FeatureCollection",
-  "features": [
-    {
-      "type": "Feature",
-      "properties": {
-        "id": "sizewell",
-        "name": "East Suffolk",
-        "count_of_phones": 700
-      },
-      "geometry": {
-        "type": "Polygon",
-        "coordinates": [[
-          [1.58242, 52.22035],
-          [1.58491, 52.19521],
-          [1.59971, 52.19325],
-          [1.62352, 52.19372],
-          [1.62599, 52.21901],
-          [1.58242, 52.22035]
-        ]]
-      }
-    }
-  ]
-}