Merge "Docs: Adds a redirect to allow a shorter URL for NBU page on DAC." into nyc-dev

  to: /studio/debug/index.html

- from: /sdk/compatibility-library.html

  to: /topic/libraries/support-library/index.html

- from: /billions

  to: /topic/billions/index.html

- from: /tools/extras/support-library.html

  to: /topic/libraries/support-library/index.html

- from: /training/basics/fragments/support-lib.html