* docs: adjust page heading levels
Only the page TOC should be at heading level 1. All other headings
should start at level 2. This commit also removes duplicate headings,
in continuation of #2796.
(This fix is necessary to support an auto-TOC feature.)
- Dart non-api doc pages w/ links to API entries will now have those
links translated from a TS API reference URL to a Dart API reference
URL.
- Created and ran a link checker to verify that all such links to API
entries refer to Dart.
- Fixed links to pages that have moved:
- JS & Dart: `i18n` is under now `cookbook` not `guide`
- Dart: testing page is now directly under guide.
Contributes to #1895Fixes#2273
* lifecycle-hooks: copy latest to cache
* docs(lifecycle-hooks): post-RC5 Dart resync
- TS prose: removed mention of `routerOnActivate` which no longer
exists in the new router.
- TS improvements to the sample code have also been propagated to the
Dart sample.
Contributes to #2077.
E2E tests pass now.
* post-review updates