Remove custom configuration of scss stylelint rules

[adidahiya]

In particular, max-line-length and at-extend-no-missing-placeholder. This project isn't really special enough to skip those rules. We should either fix the violations or update stylelint-config-palantir to reflect how we really write code.

blueprint/.stylelintrc

Line 9 in 31476f9

"scss/at-extend-no-missing-placeholder": null

[giladgray]

what's wrong with max line length?

[adidahiya]

Why do we need a custom line length limit? We should just use whatever is prescribed in stylelint-config-palantir.

[giladgray]

do you really want me to rewrap all those documentation paragraphs? those are the only long lines.

[giladgray]

the line length affects every single scss file

[giladgray]

ok so 100-character lines are pretty reasonable even for the docs comments, but there are a few cases where longer lines are unavoidable (such as extremely long URLs) and it's cumbersome to disable stylelint for a block comment.

we could leverage the new ignore: ["comments"] option to allow our comments to be longer? http://stylelint.io/user-guide/rules/max-line-length/