OMG você estava certo!!
Eu também tinha e posso ver que o repositório Git também redireciona para https://github.com/discourse/discourse-post-voting!! 
Mas espere… topic-voting E q&a mesclados em post-voting? Os recursos são acumulados?
Então, aqui está minha lista mais recente de plugins:
hooks:
after_code:
- exec:
cd: $home/plugins
cmd:
- mkdir -p plugins
- git clone https://github.com/discourse/docker_manager.git
- git clone https://github.com/discourse/discourse-openid-connect
- git clone https://github.com/discourse/discourse-solved
- git clone https://github.com/discourse/discourse-yearly-review
- git clone https://github.com/discourse/discourse-checklist
- git clone https://github.com/discourse/discourse-docs
- git clone https://github.com/discourse/discourse-reactions
#- git clone https://github.com/discourse/discourse-feature-voting
- git clone https://github.com/discourse/discourse-calendar
#- git clone https://github.com/discourse/discourse-gamification
- git clone https://github.com/discourse/discourse-gamification && cd discourse-gamification && git checkout 6a399b4c220f31de62049504d27ff6e50611fbef
- git clone https://github.com/discourse/discourse-follow
- git clone https://github.com/discourse/discourse-spoiler-alert
- git clone https://github.com/paviliondev/discourse-news
- git clone https://github.com/cfstras/discourse-konami.git
#- git clone https://github.com/discourse/discourse-question-answer
- git clone https://github.com/discourse/discourse-post-voting
O Discourse finalmente responde.
Mas agora outros problemas:
- O admin de plugins mostra “question & answer”…
- Quando crio um tópico, o menu de itens não está bom:
- A configuração nas configurações da categoria sempre mostra q&a
Então parece que q&a está sempre lá…