Update non-text facet descriptions

[bencomp]

This fixes #94. I started to fix the broken link, but found that I could try to improve the "More on facets" callout with other changes.

• Use "Other types of Facets" as heading;
• Rephrase the introduction about non-text facets;
• fix the broken link and move the reference to the Ecology lesson inside an instructor note;
• emphasise that that link goes to a different lesson.

[github-actions]

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⏱️ Updated at 2023-05-24 15:05:42 +0000