Update docs

[phoebe-p]

Update documentation, add more notebook examples.

[codecov]

Codecov Report

Merging #26 (d766873) into devel (527bbfe) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##            devel      #26   +/-   ##
=======================================
  Coverage   90.62%   90.63%           
=======================================
  Files          20       20           
  Lines        2314     2316    +2     
=======================================
+ Hits         2097     2099    +2     
  Misses        217      217           

Impacted Files	Coverage Δ
rayflare/matrix_formalism/multiply_matrices.py	97.31% <ø> (ø)
rayflare/matrix_formalism/process_structure.py	96.90% <ø> (ø)
rayflare/options.py	100.00% <ø> (ø)
rayflare/rigorous_coupled_wave_analysis/rcwa.py	90.33% <100.00%> (+0.03%)	⬆️

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