For macOS window control via keyboard I recommend Spectacle (https://github.com/eczarny/spectacle). Among other options, the app can position windows by thirds which really shines for this class of screen - think three windows side-by-side each using 1280px.
I just deployed a corporate site last week using Jekyll, hosted on S3 with CloudFront using a free AWS certificate. Content management is provided by forestry.io which has been mentioned a couple times on HN and is a compelling alternative for the CMS functionality and a necessity for the client. When I think Website, this is the best 'stack' I've deployed with.
