Use DocumenterCitations.jl to manage dependencies

[abhro]

• Bump compat for Documenter.jl
• Create refs.bib file (not all citations have been added in there)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.11%. Comparing base (f8fd782) to head (9394bfd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #486   +/-   ##
=======================================
  Coverage   94.11%   94.11%           
=======================================
  Files          14       14           
  Lines        2905     2905           
=======================================
  Hits         2734     2734           
  Misses        171      171           

Flag	Coverage Δ
unittests	94.11% <ø> (ø)

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