feat: Added login/out but needs feedback on client

merge: merged upstream changes with stashed changes.

feat: added selected post provider

feat: moved pages and contents away from layout so I can use the providers

feat: made dashboard default page again

feat: added animation to sidebar text

feat: updated from app router to SPA

feat: moved load site and selected site details/context to layout so it doesn't have to re-load on every new page

feat: added selected site context to settings and posts, removed placeholder

feat: added selected site context provider

feat: updated the sidebar buttons with a little bouncy animation from the shiny-button component

fix: reset styles back to black/white

feat: introduced new layout, updated next and react

feat: updated dependencies

feat: finished updating the deploy function, no longer write any markdown to disk, only HTML so we can send it to Netlify.