Fix /page/:page routes for 2025 theme

[veganstraightedge]

Most notable change is:

Before
in 2017 theme, routes like /page/2 were handled by home#index
They were the homepage with a different collection of articles, and no "latest article"

Now
in 2025 theme, routes like /page/2 are handled by articles#index
They are the same article_archives#index

So, in the transitional time from 2017 theme to 2025, the articles#index controller action receives the /page/2 request, then does the same setup and render as home#index (literally copy/pasted from home#index)

After the transition is launched and announced, we can delete all of the double dispatch code