feat(openfga): remove almost all DSL/JSON tabs with 1 exception

[ttrzeng]

Description

References

Review Checklist

• [ ] I have clicked on "allow edits by maintainers".
• [ ] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• [ ] The correct base branch is being used, if not main
• [ ] I have added tests to validate that the change in functionality is working as expected

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[cikasfm]

@ttrzeng can you pls add before & after screenshots?

[ttrzeng]

@ttrzeng can you pls add before & after screenshots?

Before:

After:

[aaguiarz]

Should we also decrease the margin on the top of the DSL text? cc @dongniwang

[ttrzeng]

Should we also decrease the margin on the top of the DSL text? cc @dongniwang

FYI: what it will look like with less margin top:

[dongniwang]

Thanks @aaguiarz for flagging it. I did a little bit more investigation, it seems like the margin or extra padding is not a consistent thing across all pages. Some of the code blocks have the extra padding. See the configuration page for example. I'd suggest @ttrzeng to keep this PR to focus on removing the tab and have a separate effort to look into why we have extra padding on some of them. cc @dyeam0