Small doc tweaks

v2.3.7

• Add Writing Checklist
• Fix doc error wrt function expression hoisting
• Add some more JS code style to the docs

Change CSSComb leading-zero

• Change CSSComb leading-rule to null due to CSSComb bug

Add placeholder/extend and l10n/i18n to Docs

v2.3.5

• Add Sass documentation about placeholders and @extends
• Add CSS documentation on l10n and i18n best practices

Align CSSComb and Sass linter rulesets

v2.3.4

• LeadingZero aligned to enabled
• Tweaked property ordering
• NameFormat to match BEM
• NestingDepth upped to 4
• color and background-color properties no longer require explicit Sass variables

Update quote rules for CSS linter/comber

2.3.3

• Change scss-lint rule: disable the quotes rules
• Change CSScomb rule: disable the quotes rules

Update Tool & Frameworks CSS intro documentation

v2.3.2

• Update Tool & Frameworks CSS intro documentation

Add eslint config for production-ready JS

v2.3.1

• Add an eslint config file for production-ready JS

Add CSSComb

v2.3.0

• Add CSSComb
• Update documentation
• Update SCSS-lint to 0.42.2

Remove unnecessary parens rule

Completely remove the unnecessary parens rule as it had unexpected behaviour.

Amend unnecessary parens rule.

Update the unnecessary parens rule to only apply to functions.