docs: Add non-equi joins to, and revise, joins docs page

docs/source/src/python/user-guide/transformations/joins.py

@@ -1,3 +1,28 @@
+import requests
+
+
+DATA = [
+    (
+        "https://raw.githubusercontent.com/pola-rs/polars-static/refs/heads/master/data/monopoly_props_groups.csv",
+        "docs/assets/data/monopoly_props_groups.csv",
+    ),
+    (
+        "https://raw.githubusercontent.com/pola-rs/polars-static/refs/heads/master/data/monopoly_props_prices.csv",
+        "docs/assets/data/monopoly_props_prices.csv",
+    ),
+]
+
+
+for url, dest in DATA:
+    with open(dest, "wb") as f:
+        try:
+            f.write(requests.get(url, timeout=10).content)
+        except Exception as e:
+            print(f"WARNING: failed to download file {dest} ({e})")
+        else:
+            print(f"INFO: downloaded {dest}")
+
+
 # --8<-- [start:props_groups]
 import polars as pl
 

docs/source/src/rust/user-guide/transformations/joins.rs

@@ -3,6 +3,9 @@ use polars::prelude::*;
 // --8<-- [end:setup]
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // NOTE: This assumes the data has been downloaded and is available.
+    // See the corresponding Python script for the remote location of the data.
+
     // --8<-- [start:props_groups]
     let props_groups = CsvReadOptions::default()
         .with_has_header(true)

mkdocs.yml

@@ -173,7 +173,6 @@ markdown_extensions:
 
 hooks:
   - docs/source/_build/scripts/people.py
-  - docs/source/_build/scripts/prep_data.py
 
 plugins:
   - search: