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

jet457

2022-11-19 151b9851d6828ef28ed75a40e12be01e421b94d8

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const addCollapsibleCallouts = () => {
    const collapsibleCallouts = document.querySelectorAll("blockquote.callout-collapsible");
    collapsibleCallouts.forEach(el => el.addEventListener('click', event => {
        event.currentTarget.classList.toggle("callout-collapsed");
    }));
}