Add down arrow to scroll user to bottom of page (#400)

* fix sizing of onboarding modals & lint

* fix extra scrolling on mobile onboarding flow

* added message to use desktop for onboarding

* linting

* add arrow to scroll to bottom (debounced) and fix chat scrolling to always scroll to very bottom on message history change

* fix for empty chat

* change mobile alert copy

* fix div with bullet points to use list-disc instead

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Co-authored-by: timothycarambat <rambat1010@gmail.com>