Create concatenated local version of web chat javascript files

Rather than have 2 https requests to javascript files on a different server I have created a single local files.

In the original webchat files, the first file (invite.js) uses a document.write for the second file (include.js). I have commented out the document.write and concatenated the files. This is the only change I have made to the original files. This improves the performance of loading the webchat without changing any of the functionality/code.

@alexwllms @stevenwilkin @amansinghb