Add collapse behavior to nested lists in TMiR table of contents

[vcarl]

Before:

After:

[what-the-diff]

PR Summary

• Redesign of Layout and Main Styles
  The styles applied to the details elements and lists have been simplified and adjusted respectively. This streamlines layout and enhances user interface by providing a better view and behavior of site elements.

• Enhancement of Markdown Styles
  Additional styles have been set for code, details, and summary within Markdown, giving these elements a more defined appearance and improved collapsing functionality.

• Introduction of New Function for Nested List Items
  A helper function has been introduced that wraps the first nested list item with a <details> tag, enabling a collapsible feature within markdown lists. This provides a cleaner, more organized presentation of lists in the website's content.

• Modifications in Page Retrieval and Markdown Content Processing
  The page retrieval and markdown content processing methods have been modified to accept options and use the newly introduced function when specified. This introduces more flexibility and customization in content generation and display.

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