Add noindex to public index page

[votemike]

Description of what you did:

Added noindex to index page as it is rare that such a page would want to be indexed.

[codecov]

Codecov Report

Merging #7917 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7917   +/-   ##
=======================================
  Coverage   32.71%   32.71%           
=======================================
  Files        1194     1194           
  Lines       12965    12965           
  Branches     1279     1279           
=======================================
  Hits         4241     4241           
  Misses       7884     7884           
  Partials      840      840           

Flag	Coverage Δ
#front	24.81% <ø> (ø)
#unit	53.85% <ø> (ø)

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Impacted Files	Coverage Δ
...min/admin/src/containers/ProfilePage/utils/form.js	100.00% <ø> (ø)
.../admin/src/containers/Users/EditPage/utils/form.js	100.00% <ø> (ø)

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[alexandrebodin]

Can you also add the nofollow directive ;)

[alexandrebodin]

LGTM, Thanks !