message: Add XLA compile API tutorial to book.
  Cleanup notebook.
diff: @@ -11,7 +11,7 @@ upper_tabs:
  lower_tabs:
  # Subsite tabs
  other:
  - - name: Guide
  + - name: Guide & Tutorials
  contents:
  - title: XLA overview
  path: /xla/overview
  @@ -27,3 +27,7 @@ upper_tabs:
  path: /xla/shapes
  - title: Using AOT compilation
  path: /xla/tfcompile
  + - heading: Tutorials
  + - title: XLA compile API
  + path: /xla/tutorials/xla_compile
  + status: experimental
  