docs: use dedicated purple lambda favicon

Split favicon off from the logo — new docs/assets/favicon.svg (purple
gradient lambda), mkdocs favicon key repointed to it; logo unchanged.

Signed-off-by: disqualifier <dev@disqualifier.me>

docs/assets/favicon.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 1200" width="32" height="32" role="img" aria-label="Lambda">
+  <defs>
+    <linearGradient id="plOrange" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#b98fe0"/>
+      <stop offset="1" stop-color="#8f5fd6"/>
+    </linearGradient>
+  </defs>
+  <path fill="url(#plOrange)" stroke="url(#plOrange)" stroke-width="26" stroke-linejoin="round" stroke-linecap="round"
+        d="M964.0,1153.5 L956.0,1153.5 L948.0,1153.5 L940.0,1153.5 L932.0,1153.5 L924.0,1153.5 L916.0,1153.5 L909.0,1152.5 L901.0,1152.5 L894.0,1151.5 L886.5,1151.0 L879.5,1150.0 L872.5,1149.0 L866.0,1147.5 L859.0,1146.5 L853.0,1144.5 L846.5,1143.0 L840.0,1141.5 L834.0,1139.5 L828.5,1137.0 L823.0,1134.5 L817.0,1132.5 L812.0,1129.5 L807.0,1126.5 L802.0,1123.5 L797.0,1120.5 L792.0,1117.5 L787.5,1114.0 L783.0,1110.5 L779.0,1106.5 L774.5,1103.0 L770.5,1099.0 L766.5,1095.0 L762.5,1091.0 L759.0,1086.5 L755.5,1082.0 L752.0,1077.5 L748.5,1073.0 L745.5,1068.0 L742.5,1063.0 L739.5,1058.0 L736.5,1053.0 L733.5,1048.0 L730.5,1043.0 L728.0,1037.5 L725.5,1032.0 L723.0,1026.5 L720.5,1021.0 L718.0,1015.5 L715.5,1010.0 L713.5,1004.0 L711.5,998.0 L709.5,992.0 L707.0,986.5 L705.0,980.5 L702.5,975.0 L700.5,969.0 L698.5,963.0 L696.5,957.0 L694.0,951.5 L692.0,945.5 L689.5,940.0 L687.5,934.0 L685.5,928.0 L683.5,922.0 L681.0,916.5 L679.0,910.5 L676.5,905.0 L674.5,899.0 L672.5,893.0 L670.5,887.0 L668.0,881.5 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L402.0,255.5 L395.5,254.0 L3Line truncated
+</svg>

mkdocs.yml

@@ -14,7 +14,7 @@ theme:
   name: material
   language: en
   logo: assets/logo.svg
-  favicon: assets/logo.svg
+  favicon: assets/favicon.svg
   palette:
     scheme: slate
     primary: custom