Ben RdO

Fix pipeline when running with --small argument

1

In section 12 (Clean and Reconcile EIA-930 data), the file used to build residual profiles is **data/eia930/chalendar/EBA_elec.csv** if running small. This file has a different header than the one used...

In the README, under **Contribution Guidelines**, add section on forks and the related workflow to propose changes to the codebase. GitHub has a good tutorial on their [utilities](https://docs.github.com/en/get-started/quickstart/fork-a-repo).