Replace "Tool Box" references with Beamable Button instructions

[allister-beamable]

Some existing docs pages, such as https://help.beamable.com/Unity-Latest/unity/user-reference/beamable-services/live-ops/events-overview/#getting-started , reference the old "Toolbox" (or maybe "Tool Box") way of navigation. We have not had the Toolbox since 3.0.0 or maybe even earlier. Docs should instead instruct people to use the "Beamable Button" for navigation.

[allister-beamable]

Using a set phrase for the button would be useful. I think something like:

Use the Beamable Button in the upper right to...

would be good