Updated dev CSS/LESS/JS assets

[snipe]

On the tin

[what-the-diff]

PR Summary

• Upgraded Plugin Version
  The 'tableexport.jquery.plugin', an application component we use, has been updated to its newer version. This change has been echoed in two key system files - 'package-lock.json' and 'package.json'.

• Updated Plugin Information
  To make sure that the application always fetches the correct version of the plugin, the URL and a special code called 'hash' associated with the new version have been added in the 'package-lock.json' file.

• Updated Application File Version
  The identification code (or version hash) for the file 'bootstrap-table.js', part of our application, has been updated in the tracking file 'mix-manifest.json'.