update /roadmap content and rename page to /new-and-upcoming-features

[emmagifford]

Description

I have:

• updated the content in the /roadmap in line with the internal NHS Notify roadmap
• changed the title of this page to New and upcoming features
• changed the H2 headings to align with this naming convention
• updated all links to this page
• added a redirect from the old URL

Context

The current roadmap is out of date and the secondary care sector lead has asked to update it to include our secondary care work.

We need a way to highlight NHS Notify's new features - renaming this page and reframing the content around that is one way to make new features more obvious to users. 'Roadmap' is more of a technical term that not all users will be familiar with - 'features' is a better use of plain language

Type of changes

• 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

• I am familiar with the contributing guidelines
• 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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Sensitive Information Declaration

To ensure the utmost confidentiality and protect your and others privacy, we kindly ask you to NOT including PII (Personal Identifiable Information) / PID (Personal Identifiable Data) or any other sensitive data in this PR (Pull Request) and the codebase changes. We will remove any PR that do contain any sensitive information. We really appreciate your cooperation in this matter.

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