Move jQuery wrapper to its own repository

[wojciechczerniak]

Description

All our wrappers are organized as a separate packages and published to NPM. jQuery is the only one that is hidden somewhere in our main code base. To keep everything neatly organized we should extract jQuery wrapper too. New repo jquery-handsontable and NPM package just like any other wrapper @handsontable/jquery. It's going to have its own section in documentation too.

It's there, but we will make it super easy to find and use just like any other of our wrappers.

• Move code to jquery-handsontable
• Add documentation section for jQuery
• Add jQuery logo to supported frameworks