v21.2.17
docs: open external anchors in adev markdown in a new tab
docs: update cross-repo adev docs
docs: mention Angular Aria in accessibility guide
docs: normalize product name casing across docs
docs(docs-infra): fix v21 event video not responsive on mobile
docs: recommend output() over EventEmitter in reactive forms guide
fix(common): skip transfer cache for uncacheable HTTP traffic
docs: fix esbuild and TensorFlow branding on overview page
docs: fix link debbuging and extended-diagnostics
docs: fix preposition in libraries naming callout
docs(docs-infra): Throw build error on invalid guide links
docs: add angular.dev (#52536)