Simplify `.dockerignore` file by removing unnecessary exclusions to improve clarity and maintainability.

.dockerignore

@@ -1,21 +1,3 @@
-**
-
-!/.dockerignore
-!/.env.sample
-!/Dockerfile
-!/README.md
-!/pyproject.toml
-!/poetry.lock
-!/main.py
-
-!/core
-!/core/**
-
-!/*.ini
-!/*.cfg
-!/*.yaml
-!/*.yml
-
 .git
 .gitignore
 .gitattributes