Improve description metatag

[tadean]

Motivation

Currently, the description and og_description metatags default to [node:field_az_summary].

Is your feature request related to a problem? Please describe.

This behavior isn't ideal, because not every content type has [node:field_az_summary]. This results in many Quickstart pages having no metatag description unless the editor is specifically curating them.

Proposed Resolution

Describe the solution you'd like

I'd like for [node:field_az_summary] to be used where available, but if it is unavailable, there should be other defaults available. Some options:

• Render content, and perform text_summary on it to generate a summary.
• Perform sentence ranking using unsupervized TextRank algorithm
• Possible LLM summarization, but this would require a model
• In all cases, user entered description metatag takes priority.