docs: Add docs about nesting

Author: captn3m0

docs/usage/nested.md

@@ -0,0 +1,44 @@
+---
+title: Nested Queries
+parent: Usage
+nav_order: 4
+---
+Starting from `0.2.0`, queries can be nested infinitely.
+
+The following configuration is used in the [demo](../demo/):
+
+```yaml
+sqlite:
+- data: regions
+  file: *db
+  query: |
+    SELECT RegionID, RegionDescription FROM Regions
+    ORDER BY RegionID
+
+- data: regions.territories
+  file: *db
+  query: |
+    SELECT TerritoryID, TerritoryDescription FROM Territories 
+    WHERE RegionID = :RegionID
+    ORDER BY TerritoryDescription
+
+- data: regions.territories.EmployeeIDs
+  file: *db
+  query: |
+    SELECT T.EmployeeID as EmployeeID, FirstName,LastName
+    FROM EmployeeTerritories T,Employees
+    WHERE T.TerritoryID = :TerritoryID
+    AND T.EmployeeID = Employees.EmployeeID
+```    
+
+The first query generates `site.data.regions` as a list. The second query
+sets territories inside each of the regions, and the third query
+sets the list of employees inside each territory.
+
+{: .note }
+> Per Page Query
+> 
+> On the Demo website, you can see the result at 
+> [the regions page](https://northwind.captnemo.in/regions.html)
+> where each region is broken into territories, with the name 
+> of the employee under each region.

lib/jekyll-sqlite/generator.rb

@@ -79,7 +79,7 @@ def generate_data_from_config(root, config)
       key = config["data"]
       query = config["query"]
       file = config["file"]
-      
+
       db = get_database(file)
       db.results_as_hash = config.fetch("results_as_hash", true)
       path_segments = key.split(".")