Update Cargo.toml metadata throughout

`fastsim-core/Cargo.toml`:

```toml
description = "Core FASTSim models for vehicle energy usage simulation"
exclude = ["build.rs"]
authors = ["NREL/MTES/CIMS/MBAP Group <fastsim@nrel.gov>"]
homepage = "https://www.nrel.gov/transportation/fastsim.html"
readme = "../README.md"
repository = "https://github.com/NREL/fastsim"
documentation = "https://nrel.github.io/fastsim/"
```
