♻️(project) rename project from "publish" to "impress"

The repository was renamed to "impress" but the code was still
mentionning "publish".

src/backend/manage.py

@@ -1,12 +1,12 @@
 #!/usr/bin/env python
 """
-publish's sandbox management script.
+impress's sandbox management script.
 """
 import os
 import sys
 
 if __name__ == "__main__":
-    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "publish.settings")
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "impress.settings")
     os.environ.setdefault("DJANGO_CONFIGURATION", "Development")
 
     from configurations.management import execute_from_command_line