Delete lagged oil unemployment rate chart script and add new files

Removed the `lagged_oil_unrate_chart_styled.py` script as it is no longer needed. Added a `.gitignore` file, a `requirements.txt` for dependencies, and a `scripts/` directory for future development.

.gitignore

@@ -0,0 +1,11 @@
+# Python ###
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Virtualenv ###
+venv/
+
+# Data & outputs ###
+data/
+outputs/