feature request: totp support & online editor preference

[jamesliu96]

here's an example of a possible php totp implementation:

https://gist.github.com/jamesliu96/9de800a55e8abea42f84e208971b6579

perhaps one should implement a more robust one :)

make it optional, not mandatary, additional to current user-password challenge

i'll submit a pr if i have time to do so

[jamesliu96]

also could there be an option for a relatively better online editor (i.e. Monaco editor)?

[jamesliu96]

just found this #1054

LGTM although it uses a separate file instead of a single file

simply merging them should work just fine

(i rather LOVE the idea of this "single file" app implementing all sorts of features or, in code, some one line function or concise config files that are so portable that i dont even care if my server disk is totally wiped out once i have only few files backed up *data stored remotely on object storage not on logic server)