This commit updates the docs examples to Angular v13.0.0-rc.0. In
addition to updating the dependency versions, it also updates the
projects' structure and configs to more closely match what a new v13 CLI
app would look like. See, also, the [diff][1] between a basic v12.1.3
CLI app and a v13.0.0-rc.0 one.
(NOTE: v12.1.3 was the last version for which we aligned the projects
with how a new CLI app would look like.)
Additionlly:
- Since we now use RxJS v7 in docs examples, this commit removes the
extra CI steps to explicitly test the docs examples against RxJS v7.
- Since Angular v13 no longer supports IE, this commit removes an
IE-specific section from `upgrade-setup.md`.
[1]: https://github.com/cexbrayat/angular-cli-diff/compare/12.1.3..13.0.0-rc.0
PR Close#43880
Previously, the `elements` docs example only worked in browsers that
natively supported Custom Elements and ES2015 modules. Furthermore, it
didn't work on StackBlitz, because StackBlitz ignores the specified
`target` in `tsconfig.json` and uses the UMD bundles (i.e. ES5 code)
even on browsers that do support ES2015.
(NOTE: In the past, this was not a problem, because we explicitly did
not provide a StackBlitz example. This has changed in #36067.)
This commit ensures the example works on all browsers and also on
StackBlitz by providing the necessary Custom Elements polyfills.
Fixes#36532
PR Close#36536
