Mobile styles for alder donations and compare alder page

[derekeder]

• adds styles for readability on the 'Processing...' message for DataTables
• better alignment for nav-pils on mobile
• adds rows-and-columns styles to campaign donations table for better mobile display
• adds rows-and-columns styles to compare alders page

[fgregg]

i wonder if we could preserve some of the sorting capabilities? something for later.

[derekeder]

good call - sorting is a feature that is lost on mobile with these changes. i'll open an issue