Refresh bggpipe game library export

Updated collection data across the library: renamed Rivals for Catan and
Superfight Loot Crate entries, added Sunken Sailor, refreshed cover art.
embed.js and embed.css preserved as before.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

static/games/britannia/index.html

@@ -22,7 +22,7 @@
 
 Britannia allows players to re-create this epic history, re-enacting important battles in some cases, altering the course of history in others. The game rules discourage players from making historically unrealistic moves, but also give players the freedom to alter Great Britain’s history in important ways, creating countless interesting “what if?” scenarios. What if Boudicca’s Revolt against the Romans had been more successful? What if the Romans and the Romano-British had repelled the Saxon invasions of the 5th and 6th centuries? What if William the Conqueror had died during the Norman invasion of 1066?
 
-In Britannia, the players will determine the destiny of a kingdom.</div><div class="card"><div class="factrow"><b>where it lives</b> Library Kallax · D2</div></div>
+In Britannia, the players will determine the destiny of a kingdom.</div><div class="card"><div class="factrow"><b>where it lives</b> Library Kallax · C3</div></div>
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