SASS upgrade - and extra header row removed #4809
                
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Overview of what this PR does: -
this was my original aim because of "Unwanted
element rendering after column headers in tabulator-header Unwanted <br> element rendering after column headers in tabulator-header #4783"
Notes on the details: -
I could not find a plugin using the newer "modern" API to generate a css file (the closest was "rollup-plugin-sass" - but it generated javascript code wrapping the CSS styles (all within the css file).
Maybe this is the new "modern" API - I don't know.
Because those changes are included in this pull request - but formatted a differently.
Total of 28 files changed (the rest are in the dist folder).
Sorry that I committed the dist folder changes (they were generated by the app). If this is a problem - I'll remove those changes from the pull request.
Finally - i didn't mean to make such a big PR. Was just trying to make a small change in 2 files.
The big PR was because I couldn't install node-sass (it's been deprecated, and my npm would not allow the install).
Despite all the changes - I'm pretty sure that I've preserved the styling.
(also - all the tests are passing)