Move installation instructions to a snippet so that we can reuse them in both the quickstart and the installation page
Show the pip install and API key code snippets inline in the quickstart so that people don't have to immediately switch to a different page after opening the quickstart
Use Callouts and Card components for asides
Add the -U flag to the pip install so that people get the latest version of ControlFlow by default
-Uflag to the pip install so that people get the latest version of ControlFlow by default