Update links to redirected docs

.gitlab/issue_templates/Feature proposal.md

.gitlab/issue_templates/Lean Feature Proposal.md

...scripts/error_tracking/components/error_tracking_list.vue

changelogs/unreleased/docs-redirects-removal-6.yml

config/gitlab.yml.example

danger/product_intelligence/Dangerfile

data/whats_new/202008180003_13_01.yml

...scripts/status_page_settings/components/settings_form.vue

...iews/shared/promotions/_promote_burndown_charts.html.haml

...us_page_settings/__snapshots__/settings_form_spec.js.snap

lib/feature.rb

lib/gitlab/ci/templates/Maven.gitlab-ci.yml

...tlab/ci/templates/Security/License-Scanning.gitlab-ci.yml

qa/README.md

...end/error_tracking/components/error_tracking_list_spec.js