New example and improved examples doc page

[wilfonba]

Description

This PR makes some updates to the examples

• Adds 2D_triple_point to examples/
• Fixes image heights in the examples documentation page
• Corrects the 2D Rayleigh-Taylor result on the documentation page to address "recent" bug fix

Fixes: #693

Type of change

• Something else

Scope

• This PR comprises a set of related changes with a common goal

[sbryngelson]

Well done.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.79%. Comparing base (bdf3709) to head (019bbbb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #774   +/-   ##
=======================================
  Coverage   43.79%   43.79%           
=======================================
  Files          65       65           
  Lines       19055    19055           
  Branches     2325     2325           
=======================================
  Hits         8345     8345           
  Misses       9302     9302           
  Partials     1408     1408           

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