Add db and static directories to .gitignore

* db directory in root usually holds production data and causes git to
  complain about not being able to read it
* static directory in root holds the collected static files which are
  regenerated/collected at build time

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

.gitignore

@@ -2,6 +2,7 @@ ALLOWED_HOSTS
 threadchat/settings.py
 docker-compose.yaml
 docker-compose.yml
+db
 
 ### Django ###
 *.log
@@ -12,6 +13,7 @@ local_settings.py
 db.sqlite3
 db.sqlite3-journal
 media
+static
 
 # If your build process includes running collectstatic, then you probably don't need or want to include staticfiles/
 # in your Git repository. Update and uncomment the following line accordingly.