As agreed in the site structure document, revamp the Performance page such that

• Outline:
  • Asynchronous logging
  • Filtering
  • Source location information
  • Memory management (i.e., garbage-free & recyclers)
    • Add a Performance section to the Pattern Layout page and link to it
    • Add a Performance section to the JSON Template Layout page and link to it
• Revamp garbagefree.adoc
• Target 2.x, port to main