Gallery superhero fixes

[amol-anand]

• gallery options for 20 or 48 at a time with infinite scrolling and loading based on which url it is on
• horizontal masonry gallery

Items left which I will build out tomorrow:

• favorites and view buttons on the hover of gallery images
• CTA at the bottom of the short gallery
• Superhero performance

before: https://main--firefly--adobecom.hlx.live/ after: https://gallery-superhero--firefly--adobecom.hlx.live/

before: https://main--firefly--adobecom.hlx.live/drafts/amol/gallery after: https://gallery-superhero--firefly--adobecom.hlx.live/drafts/amol/gallery

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Commits

* [bd4046e](https://github.com/adobecom/firefly/commit/bd4046e170e9993e8cc9fe3d8c505cb15d5b1382) :white_check_mark: (latest) * [8178012](https://github.com/adobecom/firefly/commit/8178012afd21f710be07f3aa6810fba830170945) :white_check_mark: * [c87fc90](https://github.com/adobecom/firefly/commit/c87fc90df6fb1745385258d9f7be77969648389e) :white_check_mark: * [8af1a7b](https://github.com/adobecom/firefly/commit/8af1a7ba05f54142263e961d971318f618f62bdd) :white_check_mark: * [991b7bf](https://github.com/adobecom/firefly/commit/991b7bf06b1ba0589355f5b9f583ac0eb85802eb) :white_check_mark: * [dabd4e5](https://github.com/adobecom/firefly/commit/dabd4e533e4b881bd3d4bbba2c5469a336f049bf) :white_check_mark: * [f501428](https://github.com/adobecom/firefly/commit/f50142884541fd12e017b148b52b1582bcf05be0) :white_check_mark: * [f3903ea](https://github.com/adobecom/firefly/commit/f3903eafe631b90c03dd5a7fa0c77b08a4332dcd) :white_check_mark: * [396125a](https://github.com/adobecom/firefly/commit/396125a0d657ff1033235512512150604b374c7c) :white_check_mark: * [876af47](https://github.com/adobecom/firefly/commit/876af47b0d2db4528718100a1887a755d2493f97) :white_check_mark: * [dce86c0](https://github.com/adobecom/firefly/commit/dce86c01fe38fa4a0af76c73cf8eb97fcd13f319) :white_check_mark:

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