added login function and changed serializer to use username instead o…

[to-sta]

…f email

Contributor checklist

• This pull request is on a separate branch and not the main branch

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Description

In this PR, I have started working on the login. I have changed the serializer to use the username instead of the email. There are still some missing pieces:

• User input validation
• Error handling
• routing

Notes:

• I was thinking about the password indicator on login. Since the user already has an account and a password, it seems unnecessary to me.

• How are we showing login errors to the user?

• I used the $fetch instead of useFetch because nuxt, displayed a suggestion in the console:

[nuxt] [useFetch] Component is already mounted, please use $fetch instead. See https://nuxt.com/docs/getting-started/data-fetching

I have tested a successful login and a bad request.

Related issue

• No related issue

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[andrewtavis]

Thanks for all this, @to-sta! We can figure out the final interface a bit later, with it likely just needing to get props from the user interface in types or something along those lines 😊