fix: rename sankey URL, update icon, add to overview

Generated-By: mintlify-agent

Author: mintlify[bot]

docs.json

@@ -73,7 +73,7 @@
                       "references/chart-types/pie-chart",
                       "references/chart-types/funnel-chart",
                       "references/chart-types/treemap-chart",
-                      "references/chart-types/sankey-chart",
+                      "references/chart-types/sankey",
                       "references/chart-types/table",
                       "references/chart-types/big-value",
                       "references/chart-types/gauge",

references/chart-types/overview.mdx

@@ -14,6 +14,7 @@ In Lightdash, the data in your results tables can be visualized in a bunch of di
 - [Pie chart](/references/chart-types/pie-chart)
 - [Funnel chart](/references/chart-types/funnel-chart)
 - [Treemap chart](/references/chart-types/treemap-chart)
+- [Sankey chart](/references/chart-types/sankey)
 - [Table](/references/chart-types/table)
 - [Big value](/references/chart-types/big-value)
 - [Gauge](/references/chart-types/gauge)

references/chart-types/sankey-chart.mdx references/chart-types/sankey.mdxreferences/chart-types/sankey-chart.mdx renamed to references/chart-types/sankey.mdx

@@ -1,7 +1,7 @@
 ---
 title: "Sankey chart"
 description: "Use Sankey charts to visualize flows between categories, showing how values move from sources to targets."
-icon: "code-merge"
+icon: "diagram-sankey"
 ---
 
 <Note>