docs: README is out of sync

[jdhoffa]

workflow.pacta/README.md

Lines 54 to 58 in 03d6c13

	* `PACTA_DATA_DIR`: (default `/mnt/pacta-data`) Path where PACTA-data is located.
	Can be set to an output directory from `workflow.data.preparation`.
	* `ANALYSIS_OUTPUT_DIR`: (default `/mnt/analysis_output_dir`) Path where output files from the workflow will be written.
	* `PORTFOLIO_DIR`: (default `/mnt/portfolios`) Path where Portfolio CSV files are stored.
	* `LOG_LEVEL`: (default `INFO`) Controls verbosity of logging. Accepts standard `log4j` levels (UPPERCASE).

The .env file that I have and use for testing is something like:

data_dir="/PATH/TO/pacta-data/2023Q4"
analysis_output_dir="/PATH/TO/test_outputs"
input_dir="/PATH/TO/workflow.pacta/portfolios"

however, the README suggests I need variables like PACTA_DATA_DIR etc.