Improve cut topology leaflet plugin

[numahell]

• Add leaflet pin plugin

[codecov]

Codecov Report

Merging #22 (65464cc) into master (b66c67e) will decrease coverage by 0.22%.
The diff coverage is n/a.

❗ Current head 65464cc differs from pull request most recent head dde77b8. Consider uploading reports for the commit dde77b8 to get more accurate results

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
- Coverage   95.96%   95.73%   -0.23%     
==========================================
  Files          85       85              
  Lines        2922     2838      -84     
==========================================
- Hits         2804     2717      -87     
- Misses        118      121       +3     

Impacted Files	Coverage Δ
georiviere/river/fields.py	88.09% <0.00%> (-8.40%)	⬇️
georiviere/description/forms.py	92.30% <0.00%> (-0.42%)	⬇️
georiviere/finances_administration/forms.py	84.61% <0.00%> (-0.24%)	⬇️
georiviere/river/views.py	94.79% <0.00%> (-0.16%)	⬇️
georiviere/knowledge/views.py	98.42% <0.00%> (-0.10%)	⬇️
georiviere/maintenance/models.py	92.03% <0.00%> (-0.07%)	⬇️
georiviere/description/models.py	95.13% <0.00%> (-0.04%)	⬇️
georiviere/functions.py	100.00% <0.00%> (ø)
georiviere/river/forms.py	100.00% <0.00%> (ø)
georiviere/river/models.py	100.00% <0.00%> (ø)
... and 8 more

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