Sets jsx to preserve

[simonbs]

Next.js automatically modifies tsconfig.json to set jsx to preserve when doing npm run build, as shown below. This PR adds the change to version control.

❯ npm run build

> framna-docs@1.0.0 build
> next build

   ▲ Next.js 15.5.6
   - Environments: .env

   Creating an optimized production build ...
 ✓ Compiled successfully in 2.8s
   Skipping linting
   Checking validity of types  .
   We detected TypeScript in your project and reconfigured your tsconfig.json file for you.
   The following mandatory changes were made to your tsconfig.json:

        - jsx was set to preserve (next.js implements its own optimized jsx transform)

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