[ENABLER] Improve file structure

[yabjames]

• Reorganized the project file structure to separate the server library and the demo
  • The main library is more modular as a result because it does not include the demo
• The README.md is updated to reflect the new file structure

[github-actions]

LCOV of commit 0137738 during server_workflows.yml #46

Summary coverage rate:
  lines......: 74.6% (1095 of 1468 lines)
  functions..: 83.0% (720 of 867 functions)
  branches...: no data found

Files changed coverage rate: n/a