docs: warn about possible lost of customization

meleu

2022-04-04 3583265f80afa081bf7a1fe996a9b3fe3c4e32e0

 layouts/index.html

@@ -15,8 +15,10 @@
    <article>
        {{ if (and $.Site.Data.config.enableToc (ne .Params.enableToc false)) }}
        <aside class="mainTOC">
            <h3>Table of Contents</h3>
            {{ .TableOfContents }}
            <details {{ if $.Site.Data.config.openToc }}open {{ end }}>
                <summary>Table of Contents</summary>
                {{ .TableOfContents }}
            </details>
        </aside>
        {{end}}
        {{partial "textprocessing.html" . }}