Remove outdated anchors

I don't know why the previous major test is failing. I don't have a D9 test environment on this machine because all our sites are on D10. I'll have to check it on my personal time later.

It was failing on D9 because I used the clean_unique_id Twig filter, which was introduced in D10.1. I initially changed it to clean_id before remembering that the point of putting it in was to guarantee the description id's uniqueness. So I took out the filter entirely. If this is committed after the D11 upgrade issue - which I hope will remove D9 compatibility - then you might consider reverting those two commits to restore the clean_unique_id filter.

I'm adding another change to the description wrapper. Currently the descriptions are wrapped in a <p> tag.

The only time that the item descriptions are used is for image styles. But those descriptions are themed as an item list. The resulting <ul> are then wrapped by the <p>, which is invalid HTML. It would be better if the descriptions were wrapped in a <div> instead.