Docs data modeling improvements (#10698)

* docs: add dedicated Views guide page and minor fixes

Add a new guide-level Views page to the Data Modeling section,
covering why views matter, how they work, design best practices,
and folder organization. Also hide the calendar cubes section
in dimensions reference, fix the `id` named format to omit
grouping commas, and remove the demo deployment callout from
the getting started page.

Made-with: Cursor

* docs: restructure data modeling section into standalone pages

- Create dedicated pages: Cubes, Joins, Measures, Dimensions
- Move multi-fact queries under Views as "Multi-fact views"
- Move extending cubes under Cubes as "Extending cubes"
- Move polymorphic cubes to recipes
- Move Syntax to standalone page after AI context
- Rewrite Joins page with views-first approach
- Rewrite multi-fact page to lead with the problem
- Remove old Concepts index page, calculated-members, multi-stage-calculations
- Hide data-blending page
- Update all cross-references across 30+ files

Made-with: Cursor

Author: keydunov

docs-mintlify/docs.json

@@ -81,20 +81,24 @@
             "pages": [
               "docs/data-modeling/overview",
               {
-                "group": "Concepts",
-                "root": "docs/data-modeling/concepts/index",
+                "group": "Views",
+                "root": "docs/data-modeling/views",
                 "pages": [
-                  "docs/data-modeling/concepts/syntax",
-                  "docs/data-modeling/concepts/calculated-members",
-                  "docs/data-modeling/concepts/multi-stage-calculations",
-                  "docs/data-modeling/concepts/working-with-joins",
-                  "docs/data-modeling/concepts/code-reusability-extending-cubes",
-                  "docs/data-modeling/concepts/polymorphic-cubes",
-                  "docs/data-modeling/concepts/multi-fact-queries",
-                  "docs/data-modeling/concepts/data-blending"
+                  "docs/data-modeling/multi-fact-views"
                 ]
               },
+              {
+                "group": "Cubes",
+                "root": "docs/data-modeling/cubes",
+                "pages": [
+                  "docs/data-modeling/extending-cubes"
+                ]
+              },
+              "docs/data-modeling/joins",
+              "docs/data-modeling/measures",
+              "docs/data-modeling/dimensions",
               "docs/data-modeling/ai-context",
+              "docs/data-modeling/concepts/syntax",
               {
                 "group": "Access Control",
                 "pages": [
@@ -585,7 +589,8 @@
                   "recipes/data-modeling/cohort-retention",
                   "recipes/data-modeling/xirr",
                   "recipes/data-modeling/dbt",
-                  "recipes/data-modeling/custom-order"
+                  "recipes/data-modeling/custom-order",
+                  "recipes/data-modeling/polymorphic-cubes"
                 ]
               }
             ]

docs-mintlify/docs/data-modeling/access-control/member-level-security.mdx

@@ -145,8 +145,8 @@ them entirely, see [data masking][ref-data-masking] in access policies.
 
 [ref-data-modeling-concepts]: /docs/data-modeling/concepts
 [ref-apis]: /reference
-[ref-cubes]: /docs/data-modeling/concepts#cubes
-[ref-views]: /docs/data-modeling/concepts#views
+[ref-cubes]: /docs/data-modeling/cubes
+[ref-views]: /docs/data-modeling/views
 [ref-dap]: /docs/data-modeling/access-control/data-access-policies
 [ref-ref-cubes]: /reference/data-modeling/cube
 [ref-ref-views]: /reference/data-modeling/view

docs-mintlify/docs/data-modeling/access-control/row-level-security.mdx

@@ -65,8 +65,8 @@ cube(`orders`, {
 
 [ref-data-modeling-concepts]: /docs/data-modeling/concepts
 [ref-apis]: /reference
-[ref-cubes]: /docs/data-modeling/concepts#cubes
-[ref-views]: /docs/data-modeling/concepts#views
+[ref-cubes]: /docs/data-modeling/cubes
+[ref-views]: /docs/data-modeling/views
 [ref-cubes-sql]: /reference/data-modeling/cube#sql
 [ref-dynamic-data-modeling]: /docs/data-modeling/dynamic
 [ref-dap]: /docs/data-modeling/access-control/data-access-policies