feat: Account details, E-Mail change

[kyunal]

Adds basic account functionality. Allows editing the account details as well as changing the E-Mail address. Also includes some preparation for unified styling (e.g. by providing pre-styled Button components).

The verification page is largely taken from @FlushBG in https://github.com/vendure-ecommerce/storefront-remix-starter/pull/17 (thank you!)

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[michaelbromley]

This is good stuff! Good idea to start building up a library of reusable components too. 👍