docs: fix the issue with sidebar toc levels and people option depreca…

…tion (#7)

* fix(actions): add proper branch references

* docs(open science): correct sidebar toc level

* docs(date): documents now show last updated date

* docs(updated): deprecate use of people option

.. versionadded:: 2024.09.30

    [1] Added new "On this page" section which represents a quick
        summary of key takeaways from the whole page.

.. deprecated:: 2024.09.30

    [1] Deprecated the use of `people` options from the `contributors`
        directive as part of new change from the underlying theme.

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Signed-off-by: Akshay Mestry <xa@mes3.dev>