Updated gitignore for gh-pages

[czgdp1807]

References to other Issues or PRs or Relevant literature

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[codecov]

Codecov Report

Merging #214 into master will increase coverage by 0.004%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##            master      #214       +/-   ##
=============================================
+ Coverage   96.871%   96.876%   +0.004%     
=============================================
  Files           24        24               
  Lines         1918      1921        +3     
=============================================
+ Hits          1858      1861        +3     
  Misses          60        60               

Impacted Files	Coverage Δ
pydatastructs/linear_data_structures/arrays.py	100.000% <0.000%> (ø)