Investigate adding permalink/section links

[adamfowleruk]

[Who] As a standards body or academic writer
[What] I need to provide a permalink to sections that are consistent over time
[Value] In order to maintain a valid deep-link to content I wish to cite

E.g. via a jekyll plugin like: https://github.com/allejo/jekyll-anchor-headings

Note: MUST be accessible, not mess up screen readers, and not require JavaScript