linearity docs nb first commit

[gipster]

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[codecov]

Codecov Report

Merging #180 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
+ Coverage   86.75%   86.78%   +0.02%     
==========================================
  Files          36       36              
  Lines        3549     3549              
==========================================
+ Hits         3079     3080       +1     
+ Misses        470      469       -1

Impacted Files	Coverage Δ
alibi/explainers/cfproto.py	75.28% <0%> (+0.16%)	⬆️

[jklaise]

• Please add link to doc/source/index.rst
• The documentation is not rendering properly, please check
• I would remove the arrows on top of vectors as this notation is not used in ML
• Remove last trailing empty cell