Select 4 random heroes on heroes index page

Merged Niklas requested to merge taucher2003-group/www-gitlab-com:select-random-heroes into master

Why is this change being made?

Currently the 4 heroes listed last in the yaml file are always shown on the heroes index page (about.gitlab.com/community/heroes).

With this change, 4 random heroes get selected each time the page is built so that we can shuffle through the heroes shown on the index page.

Author Checklist

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