React Grid examples don't add the CSS content in the samples metadata jsons

[ChronosSF]

When the jsons for the code viewer metadata are created they all have this for the css file:

 {
  "hasRelativeAssetsUrls": false,
  "path": "../samples/grids/grid/binding-nested-data-1/src/index.css",
  "content": "/* shared styles are loaded from: */\r\n/* https://static.infragistics.com/xplatform/css/samples */\r\n",
  "isMain": true,
  "fileExtension": "css",
  "fileHeader": "css"
 }

Instead the content should be properly obtained from the samples' css files.