modularize src

+ merge main.py and manage.py
+ move start logic to swingmusic/__main__.py
+ add a run.py on the project root

swingmusic/lib/recipes/artistmixes.py

@@ -0,0 +1,38 @@
+from swingmusic.db.userdata import UserTable
+from swingmusic.lib.recipes import HomepageRoutine
+from swingmusic.plugins.mixes import MixesPlugin
+from swingmusic.store.homepage import HomepageStore
+
+
+class ArtistMixes(HomepageRoutine):
+    store_key = "artist_mixes"
+
+    @property
+    def is_valid(self):
+        return MixesPlugin().enabled
+
+    def run(self):
+        users = UserTable.get_all()
+
+        for user in users:
+            mix = MixesPlugin()
+            mixes = mix.create_artist_mixes(user.id)
+
+            if not mixes:
+                continue
+
+            HomepageStore.set_mixes(mixes, entrykey=self.store_key, userid=user.id)
+
+            custom_mixes = []
+            for _mix in mixes:
+                custom_mix = MixesPlugin.get_track_mix(_mix)
+
+                if custom_mix:
+                    custom_mixes.append(custom_mix)
+
+            HomepageStore.set_mixes(
+                custom_mixes, entrykey="custom_mixes", userid=user.id
+            )
+
+    def __init__(self) -> None:
+        super().__init__()