feat/react ssr

[eidellev]

• feat: added ssr config
• feat(ssr): implemented ssr support for react
• chore(tests): added tests for react ssr
• fix: made pageRootDir optional
• docs: documented react ssr in project readme
• fix: removed unused import

[github-actions[bot]]

:tada: This PR is included in version 6.1.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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