Automation of CDNJS section in README.ejs

[silviubogan]

Please do not merge this pull request yet. I work on using the CDNJS API to request less json2md fields in the package.json file for the cdnjsSection converter.

[silviubogan]

Done.

[silviubogan]

I have also prepared the change for the gridly library's package.json file's blah.description section. This is a snipped directly copied from package.json and pasted:

{
  "cdnjsSection": {
    "libName": "Gridly",
    "justTheseFileNames": [
      "gridly-core.min.css",
      "gridly-col-widths.min.css",
      "gridly.min.css"
    ],
    "afterSection": {
      "p": "If you do not need custom width columns, you will probably want to use only `gridly-core.min.css` in your page. If you do need the custom width columns, you have to include `gridly.min.css` instead."
    }
  }
},

When you agree, I can make a pull request for this too.