reformat the community model tutorial

[exaexa]

JuliaFormatter intensifies

[codecov]

Codecov Report

Merging #333 (f0dd012) into master (486efbb) will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #333      +/-   ##
==========================================
+ Coverage   90.24%   90.35%   +0.11%     
==========================================
  Files          54       52       -2     
  Lines        1343     1338       -5     
==========================================
- Hits         1212     1209       -3     
+ Misses        131      129       -2     

Impacted Files	Coverage Δ
src/base/utils/atom_exchange.jl
src/base/utils/fluxes.jl
src/base/utils/Reaction.jl	65.21% <0.00%> (+6.88%)	⬆️
src/base/utils/StandardModel.jl	90.00% <0.00%> (+23.33%)	⬆️

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