Delete all of the tools/ directory, but save the adk files by moving them up. Redirects for all the tools/ files are already in Piper\'s site-android/en/_redirects.yaml file. The new adk redirects are in this cl: https://critique.corp.google.com/#review/121302608 am: 41f7ff9150
am: c10ce54761

* commit 'c10ce54761f4bb1a887561af15a51625c902049b':
  Delete all of the tools/ directory, but save the adk files by moving them up. Redirects for all the tools/ files are already in Piper's site-android/en/_redirects.yaml file. The new adk redirects are in this cl: https://critique.corp.google.com/#review/121302608

Change-Id: Ia8bc55aab35cdfadd7b5cecf435e68b4b3b7ba60