Add API Explorer section to the Help Center

[jayk-u]

Here's the first draft of the PR for the API Explorer section in the Help Center.

• There are no screenshots at the moment, they won’t be added to the PR until the middle of next week.
• I had an issue with the preview on my end (looks like a bridgetown issue), so if someone could check if it works on their side, that would be great. (I’ll see what the preview looks like here anyway.)

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[jayk-u]

I did modify the sidebar.yaml, though. Maybe I made a mistake, I’ll check it again.

[jayk-u]

Fixed the sidebar issue, yay \o/

[ChristopheDujarric]

Great content so far!

Just one small suggestion.

Also, don't forget to add all redirects for external traffic to find the new path of existing pages, and to update all of our own content pointing to those pages with the new URLs.

[grossyoan]

Thanks for all this work Jay!

Lgtm, apart from the small comment around sharing and version mismatch.

[ChristopheDujarric]

Should we also update the contents of this one, as it's not mentioning the API Explorer yet, but it does mention the other pages in this section?

[grossyoan]

Lgtm, thanks Jay!