Major Enhancements

• site.posts is now a Collection instead of an Array (#4055)
• Add --increment flag to enable incremental regen (disabled by default) (#4059)

Minor Enhancements

• Deprecate access to Document#data properties and Collection#docs methods (#4058)
• Make a constant for the regex to find hidden files (#4032)
• Site template: refactor github & twitter icons into includes (#4049)
• Site template: add background to Kramdown Rouge-ified backtick code blocks (#4053)

Bug Fixes

• Change default font weight to 400 to fix bold/strong text issues (#4050)

Development Fixes

• Apply code block figure syntax to blocks in CONTRIBUTING (#4046)