update readme with okta section + update troubleshooting section

[HugoWith]

CAREFUL 🚨

Are you adding a new feature/fix/style tweak ? If yes push to develop branch not on main branch

Versioning

• [x] Are you sure you are pushing on the right branch?

Objective

What: 👉 Update troubleshooting section with the right version of PNPM < 8.0.0 otherwise it's causing an issue with React-Instantsearch-hook-web package 👉 Update getting started section with the right version of PNPM < 8.0.0 👉 Update Okta section

Type

• [ ] Bug Fix
• [ ] New Feature
• [ ] Performance Tweaks
• [ ] Style Tweaks
• [ ] Code Refactoring
• [x] Documentation
• [ ] Tests

Tested

Outline the approach you've taken to test the change

Translation

• [ ] Have you translated all your Paragraphs, ButtonsTitle,... with i18n functionality?

Documented

• [ ] Have you documented in changed file using comments
• [x] Have you added instructions to the README if needed?

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