Switch to using Docy's tabbed panes

[chalin]

Docy has a flexible implementation of tabbed panes that, for example supports both code and text in a tab. I suggest that we drop our own custom implementation of tabs and upgrade to Docsy's.

WDYT @svrnm @cartermp @austinlparker? I'd like your thumbs up before I start on this cleanup.

We only have about 4 files so the upgrade wouldn't be too painful, but more files are being updated (e.g., #1800) to use tabs, so if we're going to do this I think it would be better sooner than latter :).

Tasks:

• Fix erlang/elixir tabs #2527
• Cleanup content/en/docs/instrumentation/php/automatic.md #2528
• Fix tabs for c++ getting started #2529

Related:

• Erlang/Elixir tabs not working #2525

[cartermp]

Yes, please! This would allow for use of rewrap on the relevant files if code moves to code blocks.

[svrnm]

Yes, let's do that!

[chalin]

Great! Ok, I'll start that as soon as I can (and I'll add a comment to #1772) -- I'm waiting on some Docsy updates before proceeding.

[chalin]

Some tabs work with the Docsy tab-related shortcodes, but some don't yet. Waiting on:

• Tabpane shows multiple tabs at the same time google/docsy#1271