fix: #367, replace node-sass with sass

[sadn1ck]

Signed-off-by: Anik Das anikdas0811@gmail.com

Fixes

Fixes #367 by @brylie

Description

• removed node-sass
• installed sass

Technical details

• there were some warnings during build process which I'm trying to find out if I can fix
• 

Tests

• npm run serve and npm run build run without issues
• all tests pass

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[sadn1ck]

Re the warnings, sass warnings cannot be silenced, and, this particular warn is due to this https://sass-lang.com/documentation/breaking-changes/slash-div

This warns are generated within the bulma source, so I think that can be ignored for now till sass hits 2.0, which is when it will break (from what I understood)

Reference:

• Sass deprecation warning: Using / for division is deprecated twbs/bootstrap#34051 (comment)
• or we can run the migrator commands specified here: DEPRECATION WARNING: Using / for division is deprecated and will be removed in Dart Sass 2.0.0. ag-grid/ag-grid#4543 (comment)