Remove script runner and hints at the top

[gyermolenko]

related to #277

The main thing here is removal of run_all.sh.
As I understand it was used to

• run all available scripts
• coverage

These things are covered by tests and doctests.

[codecov-io]

Codecov Report

Merging #312 into master will decrease coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #312     +/-   ##
=========================================
- Coverage   36.68%   36.49%   -0.2%     
=========================================
  Files          38       38             
  Lines        1341     1307     -34     
=========================================
- Hits          492      477     -15     
+ Misses        849      830     -19

Impacted Files	Coverage Δ
patterns/structural/mvc.py	0% <ø> (ø)	⬆️
patterns/creational/factory.py	0% <ø> (ø)	⬆️
patterns/behavioral/iterator.py	0% <ø> (ø)	⬆️
patterns/behavioral/mediator.py	0% <ø> (ø)	⬆️
patterns/behavioral/state.py	97.61% <ø> (-0.06%)	⬇️
patterns/structural/front_controller.py	0% <ø> (ø)	⬆️
patterns/structural/flyweight.py	0% <ø> (ø)	⬆️
patterns/behavioral/command.py	87.5% <ø> (-0.74%)	⬇️
patterns/creational/builder.py	78.94% <ø> (-0.54%)	⬇️
patterns/behavioral/specification.py	83.6% <ø> (-0.27%)	⬇️
... and 26 more

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