Fix mobile issues in the voting page

[jpaulet]

Solve issues with responsive in mobile in the voting page:

• [x] Adjust font-size in the title (reduce to 32px) + add at least 10px of margin-top
• [x] Reduce font-size in the description (h1,h2,h3, p, etc.)
• [x] Reduce the aside size, align the content by rows instead of columns, make the text smaller
• [x] Make the "parameters list" (End date, Census Type, Created by...) smaller and align it horizontally
• [x] The questions and options don't expand to 100% of the availabe width, looking weird. Solve it
• [x] Align all the footer content to the center

Ref: