if db connection fails in index.php, try again without authentication.
get date for the 3-hr PSI table instead of the 24 hr one as NEA might not update both at the same time.
check extracted day of month against dtnow as that's the var that won't be changed later. just for consistency with getpsi.py
modified gitignore to ignore vim temp files
use try catch for db authentication so it'll work if there's no auth on the db
Add display of latest PSI and Pm2.5 values. Make page responsive. Modified chart titles and legend placement.