web: Show SHA256 sums for package integrity

So, well, Ok...
If it makes you feel better.
Well.
Ok.
Then check a longer number.
Computers are actually good at checking numbers.
Your browser checks long numbers already.
And Windows does.
But if it makes you feel better.
Well.
Ok.
You should use GnuPG to check long numbers, you know?
It's better at it.
But if it makes you feel better...