Updated allometric equations (incl. generic mangrove ELSE option), planting schedule defaults, and documentation

WIP: update files before testing hugging-er build

Dashboard cleanup: remove per-hectare chart, improve table formatting, clarify table names and titles

Add support for continuous declining increment growth; use display names for species in dashboard

Update declining_increment.yaml to match notebook parameters (initial values, growth rates, mortality)

Refactor declining_increment_growth to accumulate increments, fix negative height/DBH; enable robust multi-model support

Switch dashboard to Gradio and update dependencies

Initial commit: ER model for Nigeria mangroves