Make example module bulletproof for JSX (#25)

# Make example module bulletproof for React code

## ♻️ Current situation & Problem
Current module would fail tests if it contained React code


## ⚙️ Release Notes 
*Make example module bulletproof for React code


### Code of Conduct & Contributing Guidelines 

By submitting creating this pull request, you agree to follow our [Code
of
Conduct](https://github.com/StanfordBDHG/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordBDHG/.github/blob/main/CONTRIBUTING.md):
- [x] I agree to follow the [Code of
Conduct](https://github.com/StanfordBDHG/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordBDHG/.github/blob/main/CONTRIBUTING.md).

jest.config.js

@@ -20,8 +20,4 @@ module.exports = {
       },
     ],
   },
-  moduleNameMapper: {
-    '^@stanfordbdhg/example-package$':
-      '<rootDir>/packages/example-package/dist',
-  },
 }

packages/example-package/tsconfig.json

@@ -6,7 +6,7 @@
     "module": "commonjs",
     "target": "es6",
     "lib": ["esnext"],
-    "jsx": "preserve",
+    "jsx": "react-jsx",
     "rootDir": "src",
     "outDir": "dist",
     "esModuleInterop": true,