Rename Target to Layout

[philippjfr]

Closes #392

[codecov-commenter]

Codecov Report

Merging #393 (9a4f175) into master (dceec94) will increase coverage by 0.02%.
The diff coverage is 76.56%.

❗ Current head 9a4f175 differs from pull request most recent head 282127e. Consider uploading reports for the commit 282127e to get more accurate results

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
+ Coverage   68.15%   68.17%   +0.02%     
==========================================
  Files          73       73              
  Lines        8111     8117       +6     
==========================================
+ Hits         5528     5534       +6     
  Misses       2583     2583              

Impacted Files	Coverage Δ
lumen/filters/base.py	71.42% <ø> (ø)
lumen/ui/dashboard.py	35.82% <0.00%> (ø)
lumen/ui/main.py	38.46% <0.00%> (ø)
lumen/ui/views.py	40.50% <0.00%> (ø)
lumen/ui/builder.py	23.80% <7.14%> (ø)
lumen/ui/layouts.py	35.13% <41.66%> (ø)
lumen/dashboard.py	78.44% <80.95%> (+0.08%)	⬆️
lumen/state.py	66.53% <84.61%> (ø)
lumen/__init__.py	100.00% <100.00%> (ø)
lumen/layout.py	80.99% <100.00%> (ø)
... and 7 more

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[github-actions]

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