App Routes that are called asynchronously by the browser now return JSON instead of HTML.
Handlebars JS plugin used for templating/working with the JSON responses.

Returning JSON also helps to fix a bug where the client could become out of sync with the server if
Entries were deleted from the Redis store while the user was viewing the page. The relevant JSON response includes the
exact number of posts, so (client-side) the total number of entries can be updated directly without having to
manually manage and update its own total.

The shoe model menu now highlights the selected tag.