footer hides "Vote" button for large number of candidates

[PascalinDe]

cf. this issue vuetifyjs/vuetify#11121

(the problem is that the position of the footer is calculated before the dynamic content has been loaded)

the quick-and-dirty solution for the 30th of June vote was to remove the footer altogether, the proper long term solution is to update the application to the latest version of Vuetify where this bug is fixed

[PascalinDe]

vuetify > 3 requires vue > 3

migrating from vue 2 to vue 3 does not seem to be very straightforward - I look into it very shortly, and it doesn't seem too bad, but would still require some work and testing, which might be too much effort for an app that gets potentially sunset (??) anyway

@ineiti what do you think?

[ineiti]

Just for the record: let's see what @pierluca proposes with regard to D-voting.