Sync fork with upstream executablebooks/sphinx-book-theme (8822eef → f76b6c3)

[Copilot]

Brings the fork current with upstream through commit f76b6c3, incorporating 8 upstream commits missed since the last sync point (8822eef), while preserving all fork-specific extensions.

Applied from upstream

• _sidebar-primary.scss: pst-sidebar-hidden class for JS-driven sidebar collapse + navbar-icon-links left-alignment fix (prepare for latest pydata and python releases executablebooks/sphinx-book-theme#920)
• header_buttons/__init__.py: "classes": "pst-navbar-icon" on the fullscreen button (prepare for latest pydata and python releases executablebooks/sphinx-book-theme#920)
• pyproject.toml: Filter Argument "parser_name" will be removed in Docutils 2.0. PendingDeprecationWarning (Ignore PendingDeprecationWarning about parser_name deprecation with Docutils 0.22 executablebooks/sphinx-book-theme#919)
• launch.py: Upstream jupyterlite_url config key — accepts an absolute URL, distinct from the fork's existing relative-path use_lite_button (Jupyterlite button - patched, merged version of #655 executablebooks/sphinx-book-theme#914):

  # Upstream approach (absolute URL, flexible path):
  "jupyterlite_url": "https://my-jupyterlite.example.com/lab/index.html"
  
  # Fork's existing approach (relative path, unchanged):
  "use_lite_button": True

• CHANGELOG.md: Updated sync point reference to f76b6c3

Already present in fork (confirmed, no action needed)

Version 1.1.4, GitLab source ?plain=1 fix, new extension SCSS files, index.scss imports, addBlurToButtons/fixSidebarToggle JS functions, updated page-toc.html / toggle-secondary-sidebar.html, logo_jupyterlite.svg, pydata-sphinx-theme==0.16.1, node-version = "20.9.0".

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