Added new 'get started' pages

[jamestynan-content]

Description

This update finishes off content work started around implementing the mini-hub and creating a new 'get started' pages.

The single 'get started' page has now been broken up into several pages, using the mini-hub component.

The new content is:

• check you can use Notify
• read and understand our terms and conditions

The existing content that has been incorporated into the new mini-hub component is:

• register your interest
• onboard with Notify

Anything named "get-started-new" has been removed - this was unpublished draft content.

I have also updated a link to the onboarding page on /using-nhs-notify/create-and-submit-a-template.md - this was coming up as an error when debugging.

Context

As part of happy path, users are required to understand /do several 'pre-requistes' before they can register their interest with Notify.

This includes:

• understanding what you can/can't use Notify for
• when you need to onboard to NHS login
• technical requirements
• terms of service you need to be aware of/get a legal opinion on

The aim is to ensure users have confirmed suitability and completed preliminary requirements before registering, meaning a smoother onboarding journey and reducing back-and-forth with onboarding managers.

Relevant ticket: https://nhsd-jira.digital.nhs.uk/browse/CCM-13340

Type of changes

• [x ] Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• [x ] I am familiar with the contributing guidelines
• [x ] I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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• [x ] I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.