Docs: add 3D Navier-Stokes example

[jipolanco]

Also updated the other examples, which are now also generated using Literate.jl.

Things to do:

• [x] improve figures (use volume rendering from GLMakie?)
• [x] generate example using multiple processes
• [x] use localgrid from PencilArrays.jl
• [x] cleanup

[codecov[bot]]

Codecov Report

Merging #39 (5c5943f) into master (04c09d8) will increase coverage by 0.01%. The diff coverage is 100.00%.

:exclamation: Current head 5c5943f differs from pull request most recent head c22921d. Consider uploading reports for the commit c22921d to get more accurate results

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
+ Coverage   98.31%   98.32%   +0.01%     
==========================================
  Files           9        9              
  Lines         416      419       +3     
==========================================
+ Hits          409      412       +3     
  Misses          7        7              

Impacted Files	Coverage Δ
src/plans.jl	97.10% <100.00%> (+0.06%)	:arrow_up:

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