index.hbs

## Use `mdbook init --theme` first
## Modify the generated `theme/index.hbs
## Go to <div id="content"> and add below {{ content }
## The script that is generated here: https://giscus.app/

                <div id="content" class="content">
                    <main>
                        {{{ content }}}
                        
                        <script src="https://giscus.app/client.js"
                              data-repo="[ENTER REPO HERE]"
                              data-repo-id="[ENTER REPO ID HERE]"
                              data-category="[ENTER CATEGORY NAME HERE]"
                              data-category-id="[ENTER CATEGORY ID HERE]"
                              data-mapping="pathname"
                              data-strict="0"
                              data-reactions-enabled="1"
                              data-emit-metadata="0"
                              data-input-position="bottom"
                              data-theme="preferred_color_scheme"
                              data-lang="en"
                              crossorigin="anonymous"
                              async>
                        </script>
                    </main>