KPI-Index page change

Why is this change being made?

Closes https://gitlab.com/gitlab-data/analytics/issues/1333

Does this MR meet the acceptance criteria?

Will check in testing/pipeline https://gitlab.com/gitlab-com/www-gitlab-com/blob/master/doc/redirects_on_about_gitlab_com.md#workflowtesting

Conformity

• Added description to this MR explaining the reasons for proposed change, per say-why-not-just-what