add max height to stickied image panel in mobile view

[RyanCoulsonCA]

Related Item(s)

https://github.com/ramp4-pcar4/tcei-tmx-cwa-storylines/issues/193
https://github.com/ramp4-pcar4/tcei-tmx-cwa-storylines/issues/168

Changes

• Added a max-height to image panels so that very large images will not block the accompanying text panel.
• Added a minor box shadow under the image panel in order to break up the stickied panel and the text panel.
• Modified the init function for the interactive map panel to use await instead of Promises since it's an async function.
• Fixed an error that was popping up in the interactive map panel if the first item was returnHome point and didn't specify a layer ID.

Notes

Open to feedback on the image panel changes! I've compared TCEI product locally with the sandbox site and nothing seems to have changed drastically, other than fixing the super tall image panels.

Testing

Steps:

1. Open the demo page.
2. Ensure interactive maps are still working as expected after the changes.
3. Ensure image panels are working as expected.

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This change is 

[github-actions]

Your demo site is ready! 🚀 Visit it here: https://ramp4-pcar4.github.io/story-ramp/fix-193/#/en/00000000-0000-0000-0000-000000000000

[yileifeng]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @RyanCoulsonCA)

[spencerwahl]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @RyanCoulsonCA)