doc: add analytical ops into examples index

Author: veghdev

docs/examples/index.md

@@ -5,8 +5,9 @@ The `Vizzu` examples are grouped into four categories.
 - [Preset charts](./presets/index.md): Examples of the well-known chart types
   `Vizzu` offers a shorthand for, as described in the
   [Chart presets](../tutorial/chart_presets.md) chapter of the Tutorial.
-- [Animated charts](./animated/index.md): Simple animations from one well-known
-  chart to another to provide you with inspiration and reusable code for some
-  transitions.
+- [Analytical operations](./analytical_operations/index.md): A collection of
+  examples to help you apply animated transitions that show another facet of the
+  data under analysis. Also a great source of inspiration for finding the next
+  chart when you're building a story.
 - [Static charts](./static/index.md): Examples of well-known chart types
   configured with the original chart type-agnostic syntax of `Vizzu`.