mattdrayer/SOL-947: Refactor Web/HTML certificate URL patterns

cms/djangoapps/contentstore/views/tests/test_assets.py

cms/djangoapps/contentstore/views/tests/test_certificates.py

cms/envs/bok_choy.env.json

cms/templates/widgets/header.html

cms/urls.py

common/test/acceptance/pages/studio/settings.py

common/test/acceptance/pages/studio/settings_certificates.py

...t/acceptance/tests/studio/test_studio_settings_details.py

lms/djangoapps/certificates/views.py

test_root/uploads/.gitignore