chore: Remove realtime_setting FoF flag

[rolodato]

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Changes

This change removes the realtime_setting Flagsmith-on-Flagsmith flag, in preparation for releasing real-time flag updates outside of SaaS. Also minor wording changes for consistency with the current docs.

How did you test this code?

Manually by browsing to Project Settings.

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Name	Status	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 4, 2024 10:00pm
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 4, 2024 10:00pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Nov 4, 2024 10:00pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4798	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4798	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4798	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4798	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4798	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4798	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-57936

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/4798

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