Adds FOM for enhanced geothermal systems

[LukasFrankenQ]

Changes proposed in this Pull Request

Very small change, just adding a 2%/year FOM value for enhanced geothermal systems, as used in this paper.

Checklist

• [x] Code changes are sufficiently documented; i.e. new functions contain docstrings and further explanations may be given in doc.
• [x] Data source for new technologies is cleary stated.
• [x] Newly introduced dependencies are added to environment.yaml (if applicable).
• [x] A note for the release notes doc/release_notes.rst of the upcoming release is included.
• [x] I consent to the release of this PR's code under the GPLv3 license.

[euronion]

Looking good, can you add the processed outputs/*.csv files as well to the PR?

[LukasFrankenQ]

Jup, good call, done!

[euronion]

LGTM (CI failure related to RTD, not PR)

[LukasFrankenQ]

Tops, thanks! 😎