Updated documentation

docs/build/adapting.html

docs/build/architecture.html

docs/build/crops.html

docs/build/developing.html

docs/build/farm.html

docs/build/gis.html

docs/build/index.html

docs/build/io.html

docs/build/nature.html

docs/build/odd.html

docs/build/search.html

docs/build/search_index.js

docs/build/simulation.html

docs/build/species-dsl.html

docs/build/species.html

docs/builddocs.jl

docs/src/index.md

docs/src/nature.md

src/nature/energy.jl

src/nature/insects.jl