[EDU-2112] - Migrate REST SDK API spec Presence page to MDX#2925

GregHolmes merged 1 commit intomainably/docs:mainfrom

EDU-2112-Convert-Pub-Sub-REST-SDK-Presence-API-refs-to-MDXably/docs:EDU-2112-Convert-Pub-Sub-REST-SDK-Presence-API-refs-to-MDXCopy head branch name to clipboard