Add session and social login troubleshooting.

[ConzorKingKong]

Summary of change

Adds a list of problems that users can run into while using

Related issues

• https://github.com/supertokens/supertokens-website/issues/68
• https://github.com/supertokens/for-zenhub/issues/118

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)
• [ ] Checked for broken links? (Run cd v2 && MODE=production npx docusaurus build)

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