Add platform tabs to Beats documentation

[dedemorton]

Describe the enhancement:

Requires completion of elastic/docs#260

The quick start guides use tabbed panels to display platform-specific commands. We plan to add these tabs to other topics, but for now, this is considered an "experimental" feature of the docs.

Here's a list of known topics that need tabs:

• Add platform tabs to other topics that show commands.
  • Loading templates
  • Loading Kibana dashboards
  • Possibly functionbeat quick start where we describe various cloud configs.

Describe a specific use case for the enhancement or feature:

The tabs make the content easier to scan.

[elasticmachine]

Pinging @elastic/integrations-services (Team:Services)

[dedemorton]

I'm closing this issue because we do not see the value of adding the tabs at this time because we will be migrating to a new doc system.