Drop requirements that appear unused

[brews]

Drops requirements listed in README and requirements.txt that dscim does not appear to use or are optional.

Dropped packages are:

• click
• dask-jobqueue
• geopandas
• gurobipy
• ipywidgets
• seaborn

Updated README and CHANGELOG.

[codecov]

Codecov Report

Merging #99 (6e35a37) into main (9ce9cb5) will decrease coverage by 5.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   70.33%   65.27%   -5.06%     
==========================================
  Files          17       17              
  Lines        1847     1846       -1     
==========================================
- Hits         1299     1205      -94     
- Misses        548      641      +93     

Files Changed	Coverage Δ
src/dscim/utils/rff.py	42.24% <0.00%> (-49.78%)	⬇️

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[JMGilbert]

Geopandas and seaborn were both used in the diagnostics module that has since been moved to dscim-cil (so are probably good to be removed as requirements). I assume that click was intended for the original dscim waiter and is also good to be removed. I'm not sure what the original uses for the other packages were.

[brews]

Coverage is decreased because CI is now skipping some of the RFF tests because gurobipy isn't installed. That's expected.