Fixing environment issues

[pritamd47]

Fixes #2 (tested on local machine).

Updated the environment.yml file according to the recommendations to (1) use conda-forge whenever possible, and (2) not pin packages if not required. The new file also seems to also fix the ModuleNotFoundError: No module named 'referencing' error while starting jupyter lab.

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[ktyle]

#2 should be resolved now! Meanwhile, I think all that's needed for the dependencies in the environment.yml are the following:

dependencies:
  - python
  - pip
  - jupyterlab
  - jupyter-book
  - matplotlib
  - xarray
  - dask
  - hvplot
  - geoviews
  - planetary-computer
  - pystac-client
  - odc-stac
  - pip:
      - sphinx-pythia-theme