ui: Link to public version of extension page
ui: Link to public version of extension page

The old link was google-internal.

Change-Id: Ieb58cb9c1270dbf81cf7167b566f16fc0d4eccb1
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto