fix(docs): broken links and add check

[jeertmans]

Closes #67

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2cf5e77) to head (663ca5a).
Report is 25 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #68   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines          928       928           
=========================================
  Hits           928       928           

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[github-actions]

Benchmark results:

Benchmark	before	changes
accumulate_on_transmitters_grid_over_paths_noapprox	32.5 ms	32.3 ms: 1.01x faster
path_method_FPT	77.1 us	77.3 us: 1.00x slower
path_method_MPT	108 us	108 us: 1.00x faster
Geometric mean	(ref)	1.00x faster

Benchmark hidden because not significant (2): accumulate_on_transmitters_grid_over_paths_approx, path_method_image