Add Giphy options for modularity with sensible, performant defaults

[synth]

This adds more modularity to Giphy options while starting with sensible and performant defaults

closes #1436

This uses the Giphy concept of "renditions" to add performant grids of giphs. Ref: https://developers.giphy.com/docs/optional-settings/#renditions-on-demand Ref: https://developers.giphy.com/explorer/