One-file directories

Sometimes you may want to write a single page on something but expect to expand it to a set of pages later on. Naturally you don't want to have to change your URL.

There is a special feature to simplify this: if a directory contains just the index.html file and an empty sidebar.txt file then the sidebar generated for this directory is exactly the same as if this was a single file in the directory above

This set of tabbed pages is an example of this - the URL points to a directory but it appears in the sidebar as if it were just a file in the parent directory.