Examples improvement: highlight with/without `connectivity` in unstructured examples

[trexfeathers]

Examples improvement: highlight with/without `connectivity` in unstructured examples

[bjlittle]

My aim was to keep the gallery examples informative to showcase specific features, but simple i.e., not bloat the narrative with any deeper explanations.

Instead, there will be places in the geovista documentation where a fuller treatment and explanation of the how, what and why e.g., either through the tutorials, how-to guides or enrichment material.

Once the supporting documentation is available, then I think it would be ideal to link to the relevant material from the gallery examples.

Does that seem like a reasonable approach?