Node classification tutorial

[Dsantra92]

• Writeup
• Code cleanup

[codecov]

Codecov Report

Merging #198 (278b624) into master (c8216bc) will increase coverage by 0.85%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
+ Coverage   86.43%   87.28%   +0.85%     
==========================================
  Files          15       15              
  Lines        1364     1369       +5     
==========================================
+ Hits         1179     1195      +16     
+ Misses        185      174      -11     

Impacted Files	Coverage Δ
src/GNNGraphs/gnngraph.jl	71.42% <0.00%> (-1.08%)	⬇️
src/GNNGraphs/transform.jl	96.55% <0.00%> (-0.42%)	⬇️
src/layers/basic.jl	81.25% <0.00%> (+32.46%)	⬆️

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[CarloLucibello]

the notebook has a mixture of 4 and 8 blank indents, can we make it 4 everywhere?

[Dsantra92]

Yes sure, after I finish the text part, I will clean it up.

[CarloLucibello]

what's the status here?