Reorganize file structure

In addition to adopting a more typical directory structure, this version eliminates an initial, inconsequential 404 File not found error message. The functionality remains the same as version 1.0:

1. Reads classroom information and course roster data from JavaScript Object Notation (JSON) files.
2. Displays the information in a browser.
3. Randomly shuffles the student order whenever the page is reloaded.

The new directory structure is as follows:

• README.md
• data
  • courses.json
  • excluded-pairs.json
  • rooms.json
• index.html
• src
  • jquery-3.3.1.js
  • main.js
  • simple-cors-http-server.py