website/scripts: Add docsmg migration tool (#10658)

* add docsmg tool

* moved to the correct scripts directory

* removed test files

website/scripts/docsmg/src/migratefile.rs

@@ -0,0 +1,21 @@
+use std::{fs::read_to_string, path::PathBuf};
+
+pub fn read_migrate_file(file: PathBuf) -> anyhow::Result<Vec<(PathBuf, PathBuf)>> {
+    let contents = read_to_string(file)?;
+    let lines: Vec<String> = contents
+        .split('\n')
+        .map(|x| x.to_owned())
+        .filter(|x| x != "")
+        .collect();
+    let migrations = lines
+        .iter()
+        .filter_map(|x| x.split_once(" -> "))
+        .map(|x| {
+            (
+                x.0.parse().expect("a valid path"),
+                x.1.parse().expect("a valid path"),
+            )
+        })
+        .collect::<Vec<_>>();
+    Ok(migrations)
+}