Opening this ticket to begin building out the requirements for a v3 to support the best in modern ember. - [x] replace greenkeeper with **dependabot** - [ ] tests (regular + render-diff) for **embroider** - [ ] tests (regular + render-diff) for **engines** - [ ] tests (regular + render-diff) for **fastboot** - [x] update layout syntax components to make use of angle bracket components to minimize build time shenanigans - [ ] consider tailwind or css-blocks oriented approach as the default