Hyper docs

capabilities: validate generated contracts by @kanyesthaker in #306
release: publish a hand-written changelog for every stable release by @shalins in #314
connectors: separate v2 from legacy connectors by @kanyesthaker in #319
ios: give every channel its own icon by @shalins in #318
dev: avoid frontend timeout during clean builds by @kanyesthaker in #320
ci: run the colour contract on every change by @shalins in #321