docs: add tabs with links to relevant grid pages

Author: ugur-vaadin

articles/components/tree-grid/columns.adoc

@@ -0,0 +1,8 @@
+---
+title: Columns
+page-title: Configuring columns of the Vaadin Tree Grid component
+meta-description: Learn about aligning, freezing, grouping, headers and footers, visibility, and width of the Vaadin Tree Grid component's columns.
+order: 10
+---
+
+See <<../grid/columns#,Grid>> for details on columns.

articles/components/tree-grid/renderers.adoc

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+---
+title: Renderers
+page-title: Using renderers in the Vaadin Tree Grid component
+meta-description: Use renderers to render the contents of a Vaadin Tree Grid component's specific columns using components and native HTML elements.
+order: 20
+---
+
+See <<../grid/renderers#,Grid>> for details on renderers.

articles/components/tree-grid/selection.adoc

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+---
+title: Selection
+order: 40
+---
+
+See <<../grid/selection#,Grid>> for details on selection.