Implement a way to restrict static HTML access to directories outside data directory

[keithrbennett]

Regarding this, from the REPORTS.md file:

---

! Important Security Warning !

The generated HTML files are intended for local and individual use only. For your convenience, they contain links that enable you to navigate your data directories, but also your entire file system. Making your files accessible via a web server or screen sharing would enable the remote user to view all the files on your system and is not recommended! You can give others access to your files safely by instead sending them only the data files, most conveniently in the form of a zip file.

---

It would be nice to find a way to solve this problem. Possible solutions:

• use a JavaScript file management widget that can impose this directory restriction (if such a widget exists)
• find and document a way to confine a browser's environment, possibly by:
  • a command line option to a specific browser application, or
  • an independent sandbox mechanism of some kind (like Docker, but Docker is too heavyweight)