docs: update architecture overview diagram (#7440)

Signed-off-by: Dan Gil <dagil@nvidia.com>

docs/assets/img/dynamo-readme-overview.svg

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@@ -96,6 +96,7 @@
 
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   <rect x="328" y="256" width="160" height="88" rx="10" fill="#76B900" opacity="0.7"/>
   <rect x="330" y="256" width="160" height="88" rx="10"
         fill="white" stroke="rgba(226,232,240,0.6)" stroke-width="1" filter="url(#shadow)"/>
-  <use href="#sym-stream" x="334" y="258" width="20" height="20" style="color:#76B900;opacity:0.8"/>
   <text x="340" y="296" class="box-label">Decode</text>
   <text x="340" y="309" class="box-sub">Worker</text>
 
@@ -164,7 +196,6 @@
     <rect x="30" y="420" width="480" height="48" rx="10"
           fill="url(#green-fill)" filter="url(#green-glow)" opacity="0.75"/>
   </g>
-  <use href="#sym-transfer" x="36" y="422" width="20" height="18" style="color:white"/>
   <text x="270" y="440" class="box-label-white">NIXL</text>
   <text x="270" y="453" class="box-sub-white">Accelerated KV Transfer</text>
 
@@ -221,8 +252,8 @@
 
   <!-- KV Cache pills (lines drawn earlier, before NIXL) -->
   <rect x="136" y="384" width="60" height="16" rx="8" class="pill-green"/>
-  <text x="166" y="395" class="conn-label label-green">KV Cache</text>
+  <text x="166" y="395" class="conn-label label-green">KV Transfer</text>
   <rect x="344" y="384" width="60" height="16" rx="8" class="pill-green"/>
-  <text x="374" y="395" class="conn-label label-green">KV Cache</text>
+  <text x="374" y="395" class="conn-label label-green">KV Transfer</text>
 
 </svg>