Below are the grep results of searching for ArticleSerializer (note
there are no remaining `Search::ArticleSerializer' references).
Using `ripgrep` (e.g., `rg`), I have the following from the `main`
branch.
```log
> rg ArticleSerializer
app/services/search/reading_list.rb:
Search::ReadingListArticleSerializer
app/services/search/article.rb:
Homepage::ArticleSerializer
app/services/homepage/fetch_articles.rb:
Homepage::ArticleSerializer
spec/serializers/search/reading_list_article_serializer_spec.rb:
RSpec.describe Search::ReadingListArticleSerializer do
app/serializers/search/reading_list_article_serializer.rb:
class ReadingListArticleSerializer < ApplicationSerializer
app/serializers/homepage/article_serializer.rb:
class ArticleSerializer < ApplicationSerializer
```
Definitely want to keep pruning unused code.
This relates to exploration around #15916 and the attempted solutions in
b8105661d0