Epic Stack for content sites

Summary

1. Commit f964cbf uninstalls playwright, removes the mocks, fixtures, and e2e directories from tests directory. Also removes app/routes/_auth+/auth.$provider.callback.test.ts and app/routes/users+/$username.test.tsx e2e test files. Also modifies a few files, please see the commit history for more details.
2. Commit 829014d uninstalls a few packages, removes all the authentication related code, and modifies a few files, please see the commit history for more details.
3. Commit 7b325840 updates to the latest epic-stack and remove unnecessary code and utilities.
4. Commit 659cba49 removes unused dependencies and updates the configuration files that were missed in the previous commit.

[!IMPORTANT] Note that fly.toml has a different internal_port value. This is because the litefs.yml file was proxying the ports but since that is not the case anymore, we need to update the internal_port value in the fly.toml file.

FYI

• Toast, Honeypot, Conform, Email, and Timing utils are not removed so they can be used if needed.