Make it clear I need to refresh the page
Make it clear I need to refresh the page

The instruction to refresh the page after writing the config was buried a bit too deep
for me to notice. This should make it easier to quickly test corsica or get one running.

Actually, I updated some other bits of the doc while I was at it.
sylvestre/moz-corsica,Archaeopteryx/moz-corsica,bensternthal/moz-corsica,lonnen/moz-corsica,mozilla/moz-corsica