examples/fluids: doc - include "running the mini-app"

EULER_VORTEX - removed debugging tests from the test suite

conv_test.sh: Drop the euler_test option and degree 3 as the results almost never ma

examples/fluids: doc - include "running the mini-app"

EULER_VORTEX - removed debugging tests from the test suite

conv_test.sh: Drop the euler_test option and degree 3 as the results almost never match with different PETSc configurations

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doc: move from {math:numref} to {eq} (no visual change)

doc: replace recommonmark with MyST and migrate ReST to MyST

This offers more familiar syntax for most writing, as well as natural
$\pi$ math (versus :math:`\pi`) and markdown syntax for all ReST
fe

doc: replace recommonmark with MyST and migrate ReST to MyST

This offers more familiar syntax for most writing, as well as natural
$\pi$ math (versus :math:`\pi`) and markdown syntax for all ReST
features.

The API doc stubs remain in ReST as recommended for autodoc.

https://myst-parser.readthedocs.io/en/latest/sphinx/use.html#use-sphinx-ext-autodoc-in-markdown-files

The change was largely implemented using
https://github.com/executablebooks/rst-to-myst/ with some manual
fix-ups. Tables (both ReST built-in tables and list-table) remain under
eval-rst until they can be manually updated.

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