update dockerignore and Dockerfile (rm unused dirs)

Author: HadronCollider

.dockerignore

@@ -4,4 +4,5 @@ venv
 .ssl
 __pycache__
 Dockerfile*
-app/playground
+app/playground
+tests/selenium

Dockerfile

@@ -9,7 +9,6 @@ COPY requirements.txt requirements.txt
 RUN pip3 install --ignore-installed --no-cache-dir -r requirements.txt
 
 COPY . .
-RUN rm -rf /project/tests/selenium
 
 ENV PYTHONPATH='/project/:/project/app/'
 WORKDIR /project/app