Summary: Dub adds partner discount codes

Why It Matters: This change shows Dub is adding new ways for its users to manage their partner programs.

What Changed:

• A new changelog entry for "Partner discount codes Oct 23, 2025" was added.
• The "Log in" and "Sign Up" links moved to the top of the page.
• The "Loading status..." link was changed to "All systems operational".
• Some customer case study links were rearranged.
• Code blocks for SDK examples were added.