Documentation effort

[amoodie]

This PR will address outstanding documentation needs.

Done

• finalizing water surface and applying boundary conditions at the end of water parcel routing
• model stability, limiting bed elevation change
• modeling best practices section, with a few notes from #161

Todo:

• model stability, what sets the timestep

closes #161 closes #158

[codecov[bot]]

Codecov Report

Merging #203 (2446d07) into develop (85c9f59) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 2446d07 differs from pull request most recent head 4f4038a. Consider uploading reports for the commit 4f4038a to get more accurate results

@@           Coverage Diff            @@
##           develop     #203   +/-   ##
========================================
  Coverage    78.95%   78.95%           
========================================
  Files           12       12           
  Lines         2542     2542           
========================================
  Hits          2007     2007           
  Misses         535      535           

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