chore: use simpler bootstrap and new sentry

[mcdurdin]

Relates-to: keymanapp/keyman.com#558
Relates-to: keymanapp/shared-sites#55
Relates-to: keymanapp/shared-sites#56

TODO:

• After shared-sites PR56 merges, update BOOTSTRAP_VERSION

[darcywong00]

lgtm

[mcdurdin]

Unfortunately, tier seems to have been lost on the deployed version. Need to figure out why:

Sentry initialization complete: tier=undefined

[mcdurdin]

Unfortunately, tier seems to have been lost on the deployed version.

This appears to just be the log message that is wrong. Will still fix, but less critical:

  console.log(`Sentry initialization complete: tier=${sentryEnvironment.tier}`);

Everywhere else correctly uses sentryEnvironment.environment.