Update dependencies and revisit rules

[sme12]

1. The library refers to an outdated version of stylelint-config-standard and it's currently having compatibility issues with the latest stylelint versions.
2. Some of the rules are marked as deprecated by stylelint.

 - The "max-empty-lines" rule is deprecated.
 - The "number-leading-zero" rule is deprecated.
 - The "selector-list-comma-newline-before" rule is deprecated.
 - The "selector-list-comma-space-after" rule is deprecated.
 - The "string-quotes" rule is deprecated.
 - The "indentation" rule is deprecated.

Stylelint recommendations are:

These rules are deprecated — we won't fix bugs nor add options, and we will remove them in the next major release. We recommend you use a pretty printer (like Prettier) alongside Stylelint rather than these rules.