Update _index.md

[MarketingYeti]

copyediting

[codecov]

Codecov Report

Merging #932 (a888bf6) into develop (b191eff) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #932   +/-   ##
========================================
  Coverage    18.54%   18.54%           
========================================
  Files          338      338           
  Lines        11483    11483           
========================================
  Hits          2130     2130           
  Misses        9353     9353           

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