This implements optional SSO via OIDC for logging in and signing up (for the first admin sign up or if sign up is allowed). The most requested feature!
Tested with Authentik and Google!
It includes a new `SimpleCache` interface (in-memory, using [`caches`](https://developer.mozilla.org/en-US/docs/Web/API/Window/caches)) for storing the state and code challenges.
Closes#13
* Add TOTP MFA Support
* Add Passkey MFA Support
It's not impossible I missed some minor cleanup, but most things make sense and there isn't a lot of obvious duplication anymore.
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Co-authored-by: Bruno Bernardino <me@brunobernardino.com>
This refactors the data handlers into a more standard/understood model-like architecture, to prepare for a new, more robust config system.
It also fixes a problem with creating new Notes and uploading new Photos via the web interface (related to #58).
Finally, it speeds up docker builds by sending in less files, which aren't necessary or will be built anyway.
This is all in preparation to allow building #13 more robustly.
