fix: filter questions without responses out of generated docs

[jessicamcinchak]

See theopensystemslab/planx-core#556 for context

Testing notes:
This flow has a sticky note question, put-to-user question, and auto-answered question https://3918.planx.pizza/testing/docs-test/published?analytics=false

Here's how each should be handled by the following components / documents:

• Result: put-to-user and auto-answered questions may be included under "Reasons" depending on flags, only put-to-user questions should have a "change" link
• Review: only put-to-user questions are included, all have "change" link
• Submission docs:
  • overview.html: put-to-user and auto-answered questions are included, with "auto-answered" annotation
  • application.csv: put-to-user and auto-answered questions are included, with "auto" metadata
  • application.json (responses): put-to-user and auto-answered questions are included, with "auto" metadata

None of the above should ever include the sticky note question title/text with an empty answer!

[github-actions]

Removed vultr server and associated DNS entries

[jessicamcinchak]

Automation & filtering logic followups