Eliminate duplicate init call

[alisher-aituarov]

Summary of change

Update non-react app examples to use supertokens-auth-react on the main route instead of supertokens-web-js

Related issues

• https://github.com/supertokens/supertokens-auth-react/issues/616

Checklist

• [ ] Algolia search needs to be updated? (If there is a new sub docs project, then yes)
• [ ] Sitemap needs to be updated? (If there is a new sub docs project, then yes)
• [x] Checked for broken links? (Run cd v2 && MODE=production npx docusaurus build)
• [ ] Changes required to the demo apps corresponding to the docs?

Remaining TODOs for this PR

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