Docs: Adds a redirect to allow a shorter URL for NBU page on DAC. am: 4dd89b6d am: c1f941e1

  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