Improve discovery and browsing of post series

Is your feature request related to a problem? Please describe.

DEV supports post series, and navigation between posts within an existing series works well. The main problem is discovering a series in the first place.

There is currently no dedicated way to search for or browse series by name, topic, or popularity. As a result, readers often need to encounter one post from the series first, or receive a direct link, before they can discover the rest of the series.

This makes multi-part content significantly more dependent on direct links and individual post discovery.

Describe the solution you'd like

Introduce a dedicated series discovery experience.

Possible options include:

• A searchable series directory.
• A dedicated "Series" section or tab.
• Search results that can surface series directly.
• A discovery feed for popular or highly engaged series.
• Better metadata on series landing pages, such as descriptions and topics.

The existing navigation between posts in a series could remain unchanged; the main goal is to improve the discovery layer before a reader enters the series.

Describe alternatives you've considered

• Linking every part of a series manually from individual posts.
• Promoting the series through the author's profile.
• Sharing direct links to the series externally.
• Relying on readers discovering multiple posts independently through the main feed.

These approaches help with distribution but do not provide a native discovery mechanism.

Additional context

I originally described this problem in my DEV post:

https://dev.to/dj29/5-devto-features-i-wish-existed-3-im-genuinely-relieved-they-dont-3b8n

The important distinction is that series navigation itself is already useful. The missing piece is helping readers discover series they would actually want to read.