Add user PFP support and context to logo (#408)

* 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

* WIP adding PFP upload support

* WIP pfp for users

* edit account menu complete with change username/password and upload profile picture

* add pfp context to update all instances of usePfp hook on update

* linting

* add context for logo change to immediately update logo

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

* fix: small changes

* update multer file storage locations

* fix: use STORAGE_DIR for filepathing

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