Complete edx-sphinx-theme DEPR in edx org

[robrap]

AC:

• Usage of edx-sphinx-theme in the edx org has been removed.

Additional Notes:

• DEPR: https://github.com/openedx-unsupported/edx-sphinx-theme/issues/184
• Instructions: https://docs.openedx.org/en/latest/developers/how-tos/switch-to-the-sphinx-book-theme.html
• The repos in the edx GitHub org that still depend on this theme:

timmc@edx-timmc:~/mirrored-orgs/edx$ ack -i edx.sphinx.theme== */requirements/ -l | cut -d/ -f1 | sort | uniq 
braze-client
commerce-coordinator
dbt-schema-builder
demographics
edx-arch-experiments
edx-exams
edx-name-affirmation
financial-assistance
getsmarter-api-clients
learner-pathway-progress
monitoring-scripts
outcome-surveys
platform-plugin-coaching
platform-plugin-notices
portal-designer
program-intent-engagement
subscriptions
video-encode-manager

• The common constraint was removed, but we think that upgrades may be picking up the right version for some reason, which is good. Otherwise, this constraint would need to be copied into the other repos. See https://github.com/openedx-unsupported/edx-sphinx-theme/issues/184
  • I closed the ticket to remove this common constraint: Remove Sphinx Common Constraint openedx/edx-lint#338