docs: add Abhijeet's math-wiki to the showcase (#228)

jet457

2022-11-19 151b9851d6828ef28ed75a40e12be01e421b94d8

 assets/js/popover.js

@@ -27,7 +27,7 @@
            let splitLink = li.href.split("#")
            let cleanedContent = removeMarkdown(linkDest.content)
            if (splitLink.length > 1) {
              let headingName = splitLink[1].replace(/\-/g, " ")
              let headingName = decodeURIComponent(splitLink[1]).replace(/\-/g, " ")
              let headingIndex = cleanedContent.toLowerCase().indexOf("<b>" + headingName + "</b>")
              cleanedContent = cleanedContent.substring(headingIndex, cleanedContent.length)
            }