[#2151] Update Stylelint

[sopa301]

Part of #2151.

Proposed commit message

Update Stylelint

The depreciated rules have been moved to a dedicated plugin. We can now
update our Stylelint linter to the latest version.

Let's do so, as well as update related dependencies.

Other information

This was done in a separate PR because:

1. It involves breaking changes
2. It replaces a large part of the Stylelint installation

There's a few new rules that the updated Stylelint has added. I have disabled them for now, and we should discuss which ones to enable. Here's the list:

• shorthand-property-no-redundant-values
• declaration-empty-line-before
• selector-class-pattern
• color-function-notation
• alpha-value-notation
• comment-empty-line-before
• property-no-vendor-prefix
• selector-pseudo-element-colon-notation
• at-rule-empty-line-before
• font-family-name-quotes
• color-hex-length
• scss/at-import-no-partial-leading-underscore
• scss/at-import-partial-extension
• scss/load-no-partial-leading-underscore
• scss/double-slash-comment-empty-line-before
• scss/double-slash-comment-whitespace-inside
• scss/dollar-variable-pattern

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