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/

requirements.txt

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+pandas>=1.5.0
+pandas\_datareader>=0.10.0
+matplotlib>=3.5.0
+lxml>=4.6.0
+python-dateutil>=2.8.1

scripts/pyproject.toml

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+# pyproject.toml
+
+[project]
+name = "lagged-oil-unrate"
+version = "0.1.0"
+description = "Plot UNRATE vs WTI oil price with adjustable lag"
+authors = ["Your Name <[email protected]>"]
+dependencies = [
+  "pandas>=1.3.0",
+  "pandas_datareader>=0.10.0",
+  "matplotlib>=3.4.0",
+  "python-dateutil>=2.8.0",
+  "lxml>=4.6.0"
+]