fix(generator-cli): support title property on readme features

[dsinghvi]

Short description of the changes made

Adds title so we can control titles on features in README generation.

What was the motivation & context behind this PR?

Want to add custom title to a feature in the TypeScript SDK.

How has this PR been tested?

Yup, see newly added testcase.

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📦 Next.js Bundle Analysis for fern-platform-monorepo

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This PR introduced no changes to the JavaScript bundle! 🙌

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Playwright test results

 97 passed
 1 flaky
 3 skipped

Details

 101 tests across 10 suites
 1 minute, 22 seconds
 75429ba

Flaky tests

chromium › forward-proxy/nextjs.spec.ts › capture the flag

Skipped tests

chromium › posthog.spec.ts › Posthog loads successfully
chromium › proxy.spec.ts › multipart-form upload
chromium › proxy.spec.ts › json request

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