add documentation and promotion for (WCC) JSX support

[thescientist13]

Summary

We should add a page to the plugin's list promoting the JSX Import plugin
https://greenwoodjs.dev/docs/plugins/

Link to the WCC docs
https://wcc.dev/docs/#jsx

Additional Details

Some additional thoughts

• It should also highlight Signals usage
• We should add JSX example to the home page snippets

Greenwood Issue

ProjectEvergreen/greenwood#1667