issue #2243 -- prefer f-strings over %-interpolation

edited docs to prefer f-strings, then str.format(), and remove %-interpolation

additional ad-hoc documentation fixes, as opportunities seen:
- replace Built-In Function (BIF) "min" variable with "mins"
- prefer BIF str(var) over "%s" % var
- reformat some code examples to clarify multiple args passed to functions
- change some single-quote strings to double-quotes for consistency
- fix mismatched parens

misc edits:
- add .vscode/ to gitignore

docs/source/Components/Batch-Code-Processor.md

@@ -91,13 +91,12 @@ Below is a version of the example file found in `evennia/contrib/tutorial_exampl
     table = create_object(Object, key="Blue Table", location=limbo)
     chair = create_object(Object, key="Blue Chair", location=limbo)
     
-    string = "A %s and %s were created."
+    string = f"A {table} and {chair} were created."
     if DEBUG:
         table.delete()
         chair.delete()
-        string += " Since debug was active, " \
-             "they were deleted again." 
-    caller.msg(string % (table, chair))
+        string += " Since debug was active, they were deleted again." 
+    caller.msg(string)
 ```
 
 This uses Evennia's Python API to create three objects in sequence.