refactor(nxext): remove schematics

[nx-cloud[bot]]

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✅ Successfully ran 4 targets

- [`nx affected --target=test --parallel=3 --ci --code-coverage`](https://cloud.nx.app/runs/0QyvmQ9KUY?utm_source=pull-request&utm_medium=comment) - [`nx affected --target=build --parallel=3`](https://cloud.nx.app/runs/cqWPNTBoNq?utm_source=pull-request&utm_medium=comment) - [`nx affected --target=lint --parallel=3`](https://cloud.nx.app/runs/sLQQOmm3Qs?utm_source=pull-request&utm_medium=comment) - [`nx-cloud record -- pnpm exec nx format:check`](https://cloud.nx.app/runs/jeS2dSPQGe?utm_source=pull-request&utm_medium=comment)

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