Joel Sherrill 13237ab34b layout.html: Revert patch forcing Spinx to >= 6.0
Unfortunately, updating past Sphinx 5.x results in unordered bullet
lists not formatting correctly as show in a screen capture attached
to #4928. Revert this patch until the issue is resolved and output
is reviewed for other potential issues.

    From: Utkarsh Verma <utkarsh@bitbanged.com>
    Date: Wed, 14 Jun 2023 05:36:26 +0000
    Subject: [PATCH] eng: Fix builds for newer Sphinx versions (>=7)

    The current Sphinx theme depends on the `style` parameter which got
    deprecated in v5.1 and finally got removed in v7. Now, the `styles` key
    should be preferred which is a list of stylesheets. This commit
    implements this change.

Updates #4915.
Updates #4928.
2023-07-25 15:20:12 -05:00
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