Create improved Dockerfile with volume mounts for storing data

* Add volume mounts to Dockerfile to enable persisten storing of
  database and tokens when using docker
* Makefile helps with cleanup and building the Dockerfile
* Startup fires the predictify runtime inside the container
* `.dockerignore` contains files that are not needed by the docker,
  e.g. files that would otherwise slow build process down

.dockerignore

@@ -0,0 +1,11 @@
+logs/
+data/
+src/__pycache__/
+.git
+*.md
+.venv
+LICENSE
+MAKEFILE
+pytest.ini
+test/
+