Consider pruning the hexagon examples

[rparrett]

These examples contain a lot of overlap and maintaining all of our examples is a burden.

hex_neighbors_radius_chunks - Highlights neighbors when mousing over with adjustable radius
hex_neighbors - Highlights neighbors when mousing over with convoluted method of demonstrating "neighbor index"
hex_generation - Shows how to spawn hex tiles in a hexagonal shape
hexagon_column
hexagon_row

My suggestions:

• Combine hex_neighbors_radius_chunks and hex_neighbors. Show neighbor index in label. Keep adjustable radius.
• Remove map type switching from hex_generation, or possibly do generation-in-a-hexagon-shape in hex_neighbors?
• Leave hexagon_column and hexagon_row alone?