docs: remove any Ivy mentions

[arturovt]

This commit removes all mentions of Ivy from our documentation because it's no longer necessary. Ivy was released with Angular 9, several years ago. ViewEngine was dropped at the same time. Consequently, the Ivy compiler has been the default for several years as well.

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[bundlemon[bot]]

BundleMon (Integration Projects)

Unchanged files (2)

Status | Path | Size | Limits :------------: | ------------ | :------------: | :------------: :white_check_mark: | Main bundles(Gzip)
_{hello-world-ng17/dist-integration/main.(hash)
.js}
| 68.49KB | +1% :white_check_mark: | Main bundles(Gzip)
_{hello-world-ng16/dist-integration/main.(hash)
.js}
| 67.03KB | +1%

No change in files bundle size

Final result: :white_check_mark:

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Current branch size history | Target branch size history

[codeclimate[bot]]

Code Climate has analyzed commit fa96abc7 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 66.6% (50% is the threshold).

This pull request will bring the total coverage in the repository to 95.2% (0.0% change).

View more on Code Climate.