Add "Enhanced Geothermal" generator type

[toddmedema]

FIll out all the data required in the array of GENERATORS in facilities.tsx

1. RESEARCH: When does it unlock? Aka, when in reality is it expected to reach commercialization scale?
2. RESEARCH: What's the cost modeling?
3. Unlike regular geothermal, it can be installed anywhere, so no location constraints / no increasing the cost based on # already installed