Broken meta data in HTML after #367?

[adswa]

It appears as if #367 (it introduced section numbering) also introduced a meta property HTML tag that seems to be broken and results in this:

[adswa]

Interestingly, I can't replicate the broken meta property tag locally. If I build the html files locally from the current master, the meta tag is fine:

  <meta property="og:title" content="1. Create a dataset &#8212; The DataLad Handbook">

The version build by read the docs however produces this broken tag (note the tag around the section number):

  <meta property="og:title" content="<span class="section-number">1. </span>Create a dataset &#8212; The DataLad Handbook">

[adswa]

I verified that the problem comes with Sphinx 2.3.1, which readthedocs uses by default: I upgraded from Sphinx 2.1.2 to Sphinx 2.3.1 and now have the broken meta property tag as well when I build the handbook locally.