Docs: Add links and fix class weights example

[codecov[bot]]

Codecov Report

Merging #175 (f555fce) into development (dbbdbd6) will not change coverage. The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #175   +/-   ##
============================================
  Coverage        96.07%   96.07%           
============================================
  Files              164      164           
  Lines             6823     6823           
============================================
  Hits              6555     6555           
  Misses             268      268           

Flag	Coverage Δ
unittests	96.07% <ø> (ø)

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Impacted Files	Coverage Δ
aucmedi/__init__.py	100.00% <ø> (ø)
aucmedi/ensemble/stacking.py	96.27% <ø> (ø)
aucmedi/neural_network/architectures/classifier.py	96.77% <ø> (ø)
.../neural_network/architectures/image/densenet121.py	100.00% <ø> (ø)
.../neural_network/architectures/image/densenet169.py	100.00% <ø> (ø)
.../neural_network/architectures/image/densenet201.py	100.00% <ø> (ø)
...ural_network/architectures/image/efficientnetb0.py	100.00% <ø> (ø)
...ural_network/architectures/image/efficientnetb1.py	100.00% <ø> (ø)
...ural_network/architectures/image/efficientnetb2.py	40.00% <ø> (ø)
...ural_network/architectures/image/efficientnetb3.py	100.00% <ø> (ø)
... and 53 more

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[muellerdo]

Nice, thanks for your great contribution! :)