added reproducibility to index.md and make.jl

[00krishna]

• updated index.md with reproducibility code
• updated make.jl
• confirmed "built" not "build".
• README unchanged.

[codecov[bot]]

Codecov Report

Merging #48 (6aa580c) into master (b0c1081) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   95.91%   95.91%           
=======================================
  Files           1        1           
  Lines          98       98           
=======================================
  Hits           94       94           
  Misses          4        4           

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