fix(pageHeader): update subheading external link icon

[zanewoodfin]

What's included

• fix(pageHeader): update subheading external link icon
  • pageHeader, update external link icon from ExternalLinkSquareAltIcon to ExternalLinkAltIcon

How to test

Local run check

1. update the NPM packages with $ yarn
2. $ yarn start
3. visit /rhel-sw/all and confirm the link icon in the header is correct

Example

Updates issue/story

Updates #367

[codecov-commenter]

Codecov Report

Merging #369 into ci will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               ci     #369   +/-   ##
=======================================
  Coverage   92.47%   92.47%           
=======================================
  Files          64       64           
  Lines        1528     1528           
  Branches      355      355           
=======================================
  Hits         1413     1413           
  Misses        100      100           
  Partials       15       15           

Impacted Files	Coverage Δ
src/components/pageLayout/pageHeader.js	100.00% <ø> (ø)

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[cdcabrera]

LGTM

[bclarhk]

👍