Docs Workflow, README, and ArrayIndex boundschecks

[Tokazama]

• Added workflow for docs
• Removed the docs from README so they could stay up to date
• Added @boundscheck to MatrixIndex subtypes

[codecov]

Codecov Report

Merging #177 (81a1b52) into master (91795a6) will increase coverage by 0.11%.
The diff coverage is 96.00%.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
+ Coverage   83.52%   83.63%   +0.11%     
==========================================
  Files          11       11              
  Lines        1633     1644      +11     
==========================================
+ Hits         1364     1375      +11     
  Misses        269      269              

Impacted Files	Coverage Δ
src/stridelayout.jl	88.61% <83.33%> (+0.24%)	⬆️
src/array_index.jl	97.38% <100.00%> (+0.08%)	⬆️

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[chriselrod]

Thanks!