Update outdated react links index.md with new react links and info

[ucefkh]

Fixes #SOME_ISSUE_NUMBER

Changes proposed in this pull request:

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[chrome-devrel-infra[bot]]

:white_check_mark: Preview (static) for commit f2c74aa0ff5d0bfe7893bd3709545ac58af28e7b available at https://pr-6621-static-dot-dcc-staging.uc.r.appspot.com/.

The following pages likely changed with this PR:

• https://pr-6621-static-dot-dcc-staging.uc.r.appspot.com/docs/lighthouse/performance/dom-size/

[ucefkh]

CLa signed too