docs: update docs to point to migration docs #1923

Job	Run time
Build / Build libraries	44s
Build / TypeScript compilation	24s
Lint / Commit messages	19s
Lint / Code	17s
Lint / GitHub Actions	8s
Style / Format check	20s
Test / Unit tests (libs)	48s
Test / Unit tests (schematics)	28s
Example apps / Load CI/CD configuration	5s
API Extractor / API Extractor	24s
Example apps / Example app - Angular v15 - Coverage enabled	1m 23s
Example apps / Example app - Angular v15 - Coverage disabled	1m 27s
Example apps / Example app - Angular v16 - Coverage enabled	1m 22s
Example apps / Example app - Angular v16 - Coverage disabled	1m 16s
Example apps / Example app - Angular v17 - Coverage enabled	42s
Example apps / Example app - Angular v17 - Coverage disabled	42s
Example apps / Example app - Angular v18 - Coverage enabled	48s
Example apps / Example app - Angular v18 - Coverage disabled	40s
E2E / Load CI/CD configuration	3s
Bundle size / Load CI/CD configuration	4s
E2E / E2E tests - Angular v15	1m 1s
E2E / E2E tests - Angular v16	1m 1s
E2E / E2E tests - Angular v17	1m 3s
E2E / E2E tests - Angular v18	48s
Bundle size / Analysis - Angular v15	14s
Bundle size / Analysis - Angular v16	14s
Bundle size / Analysis - Angular v17	16s
Bundle size / Analysis - Angular v18	14s
Bundle size / Store - Angular ${{ matrix.cli-version-alias }}	0s
Docs / Docs build & deploy	0s
Coverage / Upload to Codecov	19s
	17m 34s

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