added sanma in index

*ahem*
SANMA IS NOT REGULAR MAHJONG
SANMA IS NOT REGULAR MAHJONG
SANMA IS NOT REGULAR MAHJONG

Author: sharmayu

index.html

@@ -219,6 +219,7 @@ <h1>/mjg/ Repository</h1>
             <div class="dropdown-divider"></div>
             <a class="dropdown-item" href="tourneys.html#tourneys-vidya">/v/idya Mahjong Tourneys</a>
             <a class="dropdown-item" href="tourneys.html#tourneys-regu">Regular Tourneys</a>
+            <a class="dropdown-item" href="tourneys.html#tourneys-sanma">Sanma Tourneys</a>
             <a class="dropdown-item" href="tourneys.html#tourneys-solo">Gimmick Tourneys</a>
             <a class="dropdown-item" href="tourneys.html#tourneys-mjg">/mjg/ League</a>
             <a class="dropdown-item" href="tourneys.html#tourneys-collabs">Collabs</a>