Align some quantum sub-directories (#14134)

* Misc folder tidy

* Review comments

* Remove redundant entry

util/new_keyboard.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 # This script generates a new keyboard directory under keyboards/,
-# and copies the template files from quantum/template/ into it.
+# and copies the template files from data/templates/ into it.
 
 # Print an error message with the word "ERROR" in red.
 echo_error() {
@@ -35,11 +35,11 @@ copy_templates() {
     mkdir -p "$keyboard_dir"
 
     echo -n "Copying base template files..."
-    cp -r "quantum/template/base/." "${keyboard_dir}"
+    cp -r "data/templates/base/." "${keyboard_dir}"
     echo " done"
 
     echo -n "Copying $keyboard_type template files..."
-    cp -r "quantum/template/${keyboard_type}/." "${keyboard_dir}"
+    cp -r "data/templates/${keyboard_type}/." "${keyboard_dir}"
     echo " done"
 
     echo -n "Renaming keyboard files..."