Move action to create answers to AnswersController

It was confusing to have the action to create an answer in
`QuestionsController#answer` while the action to destroy it was
`AnswersController#destroy`.

app/components/polls/questions/options_component.html.erb

@@ -11,7 +11,7 @@
                       "aria-pressed": true %>
       <% else %>
         <%= button_to question_option.title,
-                      answer_question_path(question, answer: question_option.title),
+                      question_answers_path(question, answer: question_option.title),
                       remote: true,
                       title: t("poll_questions.show.vote_answer", answer: question_option.title),
                       class: "button secondary hollow",

app/controllers/polls/answers_controller.rb

@@ -2,7 +2,24 @@ class Polls::AnswersController < ApplicationController
   load_and_authorize_resource :question, class: "::Poll::Question"
   load_and_authorize_resource :answer, class: "::Poll::Answer",
                                        through: :question,
-                                       through_association: :answers
+                                       through_association: :answers,
+                                       only: :destroy
+
+  def create
+    authorize! :answer, @question
+
+    answer = @question.find_or_initialize_user_answer(current_user, params[:answer])
+    answer.save_and_record_voter_participation
+
+    respond_to do |format|
+      format.html do
+        redirect_to request.referer
+      end
+      format.js do
+        render :show
+      end
+    end
+  end
 
   def destroy
     @answer.destroy_and_remove_voter_participation
@@ -12,7 +29,7 @@ class Polls::AnswersController < ApplicationController
         redirect_to request.referer
       end
       format.js do
-        render "polls/questions/options"
+        render :show
       end
     end
   end

app/controllers/polls/questions_controller.rb

@@ -1,17 +0,0 @@
-class Polls::QuestionsController < ApplicationController
-  load_and_authorize_resource :question, class: "Poll::Question"
-
-  def answer
-    answer = @question.find_or_initialize_user_answer(current_user, params[:answer])
-    answer.save_and_record_voter_participation
-
-    respond_to do |format|
-      format.html do
-        redirect_to request.referer
-      end
-      format.js do
-        render :options
-      end
-    end
-  end
-end

config/routes/poll.rb

@@ -5,8 +5,7 @@ resources :polls, only: [:show, :index] do
   end
 
   resources :questions, controller: "polls/questions", shallow: true, only: [] do
-    post :answer, on: :member
+    resources :answers, controller: "polls/answers", only: [:create, :destroy], shallow: false
-    resources :answers, controller: "polls/answers", only: :destroy, shallow: false
   end
 end