[feature] Display current choosen photo

[syu93]

Display the current chosen photo alongside with the list of the users photo

[athorel]

I managed to display the chosen photo at the beginning by doing an unshift of the photo on the array. Not what we wanted but it do the job.

[syu93]

As we may want to see users posted photos from past contests, each selected photo for a contest must be out of the current contest node which only purpose is to know if the user is registered e.g. bellow:

{
    // ...
    "-randomNode": {
        // ...
.       "currentContest": {
            "id": "-KACQlVMfncIVZtzyMRy",
            "role": "participant"
        },
        contests: {
            "-randomNode": {
                // photo infos ...
            }
        }
    }
}

[syu93]

Lazy load images

https://customelements.io/1000ch/lazyload-image/