Feat/add welcome modals

[liam-k]

Closes #16 #15 #14, #57.

Needs #50 to work properly & not show welcome modal every time.

Reviewer's task:

• [x] I didn't see no code smells
• [x] The live preview works as expected -> no regressions found

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Name	Status	Preview	Updated
screenario-react	✅ Ready (Inspect)	Visit Preview	Aug 15, 2022 at 1:51AM (UTC)