[Feature Request]: Improving Readability in Vignette Headings and Indexes

### Feature description

In all the vignettes, some headings and indexes feature backticks, which appear somewhat out of place and can make sections challenging to identify due to the smaller font size. I suggest considering alternatives like using italics or a different formatting style, or perhaps keeping it as plain text instead of backticks for code elements in headings.

Here is some screenshots for reference

Reading section

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