The issue with ambigous characters is that they are hard to write
when only seeing them, as one could confuse 0 for O with certain
typefaces for example.
Ambiguity is lessened by removing `Oo0Iil1` from the possible charset.
In order to keep a big enough pool of IDs the ID length changed from 6
to 8 characters instead, which seems like an OK tradeoff.
This is currently untested, but the backend allows creating a new poll,
getting results of an existing poll, voting and retrieving info of a
poll for display purposes.
Recaptcha is not yet implemented at this stage.
