Expand the default "About" site page with more styles.

Start by locating the default About page content and the HTML editor/save path in plugin-SimplePages; the issue provides target markup and notes that hr and code tags are removed on save. Check the existing behavior before deciding where the change belongs, then verify that the listed elements remain available after saving.

Equivalent to https://github.com/omeka/omeka-s/issues/1870. But simpler. No inbuilt embed codes do anything useful here out of the box.

Just found out, in Classic you can use the HTML editor to insert a "hr" horizontal line, but it gets erased as soon as you save the page. Same for putting text in a "code" tag (one of the menu options) - it appears as formatted in the HTML editor, but when you save the page the two tags disappear.

Something like this:

<p>This is an example page. Feel free to replace this content, or delete the page and start from scratch.</p>
<ul>
<li>This is a bullet list.</li>
<li>Second entry.</li>
</ul>
<p>Back to normal again.</p>
<ol>
<li>This is an ordered list.</li>
<li>Second entry.</li>
</ol>
<p>Back to normal again.</p>
<blockquote>This is a blockquote.</blockquote>
<p>Back to normal again.</p>
<p><a>This text is a link, which currently points to nothing.</a></p>
<p><strong>This text is bold, in a "strong" tag.</strong></p>
<p><em>This text is italicized, in an "em" tag.</em></p>
<p><span style="text-decoration: underline;">This text is underlined, using a span.</span></p>
<p>This text is <sub>subscript</sub> and <sup>superscript</sup> using "sub" and "sup", which can be used for adding notes and citations.</p>
<h1>This is an H1 title, the same size as the Page Title.</h1>
<h2>This is an H2 header.</h2>
<h3>This is an H3 subheader.</h3>
<h4>This is an H4 subheader.</h4>
<h5>This is an H5 subheader.</h5>
<h6>This is an H6 subheader.</h6>
<pre>This text is using the "Formatted" setting in the HTML editor.</pre>