feat: add ai course generator ( #8322 )
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* Course landing page
* Add ai course page
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip: error handling
* wip
* wip
* wip
* wip: ai course progress
* wip
* wip
* wip
* feat: code highlighting
* feat: usage limit
* feat: follow up message
* Update UI
* wip
* Add course content
* wip: autogrow textarea & examples
* Update types
* Update
* fix: add highlight to the AI chat
* UI changes
* Refactor
* Update
* Improve outline style
* Improve spacing
* Improve spacing
* UI changes for sidebar
* Update UI for sidebar
* Improve course UI
* Mark done, undone
* Add toggle lesson done/undone
* Update forward backward UI
* wip
* Minor ui change
* Responsiveness of sidebar
* wip
* wip
* wip: billing page
* wip
* Update UI
* fix: hide upgrade if paid user
* feat: token usage
* feat: list ai courses
* fix: limit for followup
* Course content responsiveness
* Make course content responsive
* Responsiveness
* Outline button
* Responsiveness of course content
* Responsiveness of course content
* Add course upgrade button
* Update design for upgrade
* Improve logic for upgrade and limits button
* Limits and errors
* Add lesson count
* Add course card
* Improve UI for course generator
* Update course functionality
* Refactor AI course generation
* Responsiveness of screen
* Improve
* Add responsiveness
* Improve empty billing page design
* Add empty billing screen
* Update UI for billing page
* Update UI for billing page
* Update UI for billing page
* Update billing page design
* Update
* Remove sidebar
* Update
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Co-authored-by: Arik Chakma <arikchangma@gmail.com>