feat: self hosted onboarding

[kyle-ssg]

Thanks for submitting a PR! Please check the boxes below:

• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

Adds an onboarding flow for new self-hosted instances.

• Registers the user and creates the organisation in 1 workflow,

• Migrates version endpoint and homepage to RTK in order to determine if onboarding is necessary

• Adds resources panel for company self-hosted emails, allows initialising crisp

• Sends more information to crisp

• Todo: Add an approach to detecting onboarding needs to happen in the versions endpoint

• If we are to link to getting started docs, we just need a url for them to live in

• If there's any other info we might want to gather it'd need specifying

todo:

• Needs an endpoint like the following that returns a user token

/onboarding
{
    first_name: string
    last_name: string
    email: string
    password: string
    contact_consent_given: boolean // consent to contact about onboarding etc 
    organisation_name: string
  }

• Needs a way of knowing the instance has no users, ideally in the /version endpoint

https://github.com/user-attachments/assets/308ad636-48b8-46cd-b0ae-f98ca94e02dc

How did you test this code?

[vercel]

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5057	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5057	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-e2e:pr-5057	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith:pr-5057	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5057	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5057	Finished ✅	Results ✅

[github-actions]

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