feat: Add half-star icons

[jletey]

Closes #452

[codecov]

Codecov Report

Merging #642 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #642   +/-   ##
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  Coverage     100%   100%           
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  Files           5      5           
  Lines          34     34           
  Branches        3      3           
=====================================
  Hits           34     34

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[locness3]

Would you mind removing the filled rectangle on second icon, putting the svg attributes into the svg tag, and formatting it like other icons ?

[jletey]

@locness3 Like this? I have removed the background and formatted!