added explore button and removed unused feature openai key
# Description
Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.
## Checklist before requesting a review
Please delete options that are not relevant.
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged
## Screenshots (if appropriate):
* 🗃️ update and add fields in brains table
* ✨ update endpoints for more brain attribute
* ✨ new set as default brain endpoint
* 🔥 remove update brain with file
* ✏️ fix wrong auto imports
* 🐛 fix max tokens for model in front
* 🚑 post instead of put to set default brain
* 🚑 update brain creation endpoint with new fields
* feat: add empty access list message
* feat: set default role to viewer
* feat: reset user invitation form after submit
* feat: add removing access indicator
* feat: add brain name on invitation page
* feat: display brain name on chat page
* feat: clear localStorage on logout
* ♻️ use Single Responsibility Principle on brains_subscription
* ✨ new brain subscription endpoints for invited user
* 📝 add documentation to endpoints
* 🎨 add base_frontend_url to send custom url for brain share
* ✏️ brains instead of brain in url
* ✨ use origin in header for frontend url in subscription email
* 🚚 move and remove unused code
* ✨ new subscription API for BE endpoints in frontend
* ✨ new addBrain to add a shared brain in frontend
* 🥚 new hook for brain invitations
* ✨ new page for brain invitation
* ✨ change frontend url to copy for brain subscription
* ✏️ call RBAC with wrapper function
* ✏️ last typos
* feat(ShareableBrain): add get brain users endpoints
* feat(sdk): add getBrainUsers
* feat(ShareableBrain): display users with access
* feat: rename role to rights
* fix(Brain): fecth brains on auth status change
* refactor(MultipleBrain): separate providing and data fetching
* refactor(MultipleBrain): update useBrainApi
* feat(MultipleBrains): remove unnecessary data fetchings
* test(useBrainApi): update unit tests
