docs: Docs/remove public roadmap

[asaphko]

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

• [X] 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

This PR removes the public roadmap from our docs, and remove the links to it from other page (as well as an old redirect)

How did you test this code?

manually.

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Dec 3, 2025 11:01am

2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	Ignored			Dec 3, 2025 11:01am
flagsmith-frontend-staging	Ignored			Dec 3, 2025 11:01am