Added docs for new extrude capabilities

[Jojain]

Added examples for extrude and cutblind until extrusion parameter

Updated weird leftover text in Example page

[codecov]

Codecov Report

Merging #894 (bc6bf9e) into master (f19c35c) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #894      +/-   ##
==========================================
+ Coverage   95.91%   95.94%   +0.02%     
==========================================
  Files          32       32              
  Lines        7817     7825       +8     
  Branches      846      846              
==========================================
+ Hits         7498     7508      +10     
+ Misses        186      184       -2     
  Partials      133      133              

Impacted Files	Coverage Δ
cadquery/cq.py	91.49% <ø> (+0.09%)	⬆️
cadquery/selectors.py	98.12% <ø> (-0.02%)	⬇️
tests/test_cadquery.py	99.24% <0.00%> (+<0.01%)	⬆️
cadquery/cqgi.py	79.50% <0.00%> (+0.40%)	⬆️

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[Jojain]

I also added a note for revolve has I got confused recently of the relative axis behaviour

@adam-urbanczyk @marcus7070 @jmwright
This is ready for review.

I'm not too sure about the "skyscrappers" example, I wanted to expose a bit more of advanced operations as well as the cutBlind example, but I'm not sure it's a good example. Let me know if you want it changed/removed.

The tests has failed due to :

..\_test_env\lib\site-packages\vtkmodules\all.py:50: in <module>
    from .vtkIONetCDF import *
E   ImportError: DLL load failed while importing vtkIONetCDF: The specified procedure could not be found.

I don't know how my change would impact this but, even with a retrigger of CI it's failing at the same place

[marcus7070]

Thanks @Jojain!

[lorenzncode]

@Jojain May I suggest a small typo change? I think you are going for "skyscraper" not a crapper in the sky lol.

skycrappers->skyscrapers

https://en.wiktionary.org/wiki/skyscraper
https://en.wiktionary.org/wiki/crapper

A few other minor typos:
"the algorithm in charge of finding the candidates faces do it’s search by counting"
->
"the algorithm in charge of finding the candidate faces does its search by counting"

"where extruding and cuting"
->
"where extruding and cutting"