Reordering of the manual

[MeikeWeiss]

Some reordering of the manual two avoid having two chapters about generating certain families of simplicial surfaces

[codecov]

Codecov Report

❌ Patch coverage is 83.52713% with 85 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.60%. Comparing base (427e8c7) to head (23e1e27).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
gap/PolygonalComplexes/constructing_families.gi	80.64%	84 Missing ⚠️
gap/PolygonalComplexes/constructors.gi	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
+ Coverage   70.58%   70.60%   +0.01%     
==========================================
  Files          62       61       -1     
  Lines       17269    17297      +28     
==========================================
+ Hits        12190    12213      +23     
- Misses       5079     5084       +5     

Files with missing lines	Coverage Δ
gap/Library/library.gd	100.00% <100.00%> (ø)
gap/Library/library.gi	55.43% <ø> (-8.25%)	⬇️
gap/PolygonalComplexes/constructing_families.gd	100.00% <100.00%> (ø)
gap/PolygonalComplexes/graphs.gd	100.00% <ø> (ø)
gap/PolygonalComplexes/graphs.gi	71.06% <ø> (-4.71%)	⬇️
gap/PolygonalComplexes/properties.gd	100.00% <100.00%> (ø)
gap/PolygonalComplexes/properties.gi	68.99% <100.00%> (+0.49%)	⬆️
unit_tests/Test_Generating_Families.g	100.00% <100.00%> (ø)
unit_tests/Test_Graphs.g	100.00% <ø> (ø)
gap/PolygonalComplexes/constructors.gi	88.99% <0.00%> (ø)
... and 1 more

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[MeikeWeiss]

Includes PR #76