We need a web playground to demo and verify template or data. The playground should allow user to provide:

• a base template
• several partials with names
• data as json string
• helper defined as rhai script

The data gathered from user input is passed to web assembly module. The the result or error message is given back to user.

Web playground can be deployed to github pages via github action. We will always use latest master branch to built the wasm module.