build: Remove outdated sphinx-contentui package

[sarina]

See openedx/docs.openedx.org#1417

This is an outdated package that was included in the docs cookie cutter. It can cause build errors and doesn't seem to be used.

[github-actions]

🔍 WordPress Plugin Check Report

❌ Status: Failed

📊 Report

🎯 Total Issues	❌ Errors	⚠️ Warnings
5	5	0

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❌ Errors (5)

📁 public/partials/openedx-commerce-public-display.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

📁 utils/openedx-utils.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

📁 includes/class-openedx-commerce.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

📁 includes/class-openedx-commerce-loader.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

📁 admin/partials/openedx-commerce-admin-display.php (1 error)

📍 Line	🔖 Check	💬 Message
0	missing_direct_file_access_protection	PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

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🤖 Generated by WordPress Plugin Check Action • Learn more about Plugin Check

[sarina]

@feanil trying to remove this package everywhere but I think there's deeper issues here (it's saying I'm upgrading from Py 3.8 -> Py 3.12) - should I just close this until the packages are upgraded?