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.

requirements.txt

@@ -0,0 +1,5 @@
+pandas>=1.5.0
+pandas\_datareader>=0.10.0
+matplotlib>=3.5.0
+lxml>=4.6.0
+python-dateutil>=2.8.1