remove duplicate intro

[bendichter]

Motivation

fix #1440

[codecov]

Codecov Report

Merging #1443 (d21e838) into dev (0238a37) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1443   +/-   ##
=======================================
  Coverage   77.46%   77.46%           
=======================================
  Files          37       37           
  Lines        2733     2733           
  Branches      455      455           
=======================================
  Hits         2117     2117           
  Misses        535      535           
  Partials       81       81           

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