Standups: Write getting started guide for async standups

[BartoszJarocki]

 GETTING_STARTED_RETROS = 'https://www.parabol.co/resources/retrospective-meetings',
 GETTING_STARTED_CHECK_INS = 'https://www.parabol.co/resources/check-in-meetings',
 GETTING_STARTED_SPRINT_POKER = 'https://www.parabol.co/resources/sprint-poker-meetings',
 GETTING_STARTED_ASYNC_STANDUP = 'https://www.parabol.co/resources/async-standup-meetings', // TODO

Similarly to other types of meetings, we'll need a getting started guide which will be linked in new meeting screen.

Originally posted by @Dschoordsch in #6082 (comment)_

[jordanh]

Should we do this? Should Growth do this?

[BartoszJarocki]

I created it so we have a reminder. For now, I think we should skip it until we're sure about the shape of the standups.

[jordanh]

Labeling as discussion. Adding to milestone. Removing from backlog until AC and EE are defined