Updated the weather links

I fixed and updated some of the weather links that were broken.

• The Windity link now goes straight to the map and airgram for Blackheath.
• For the blipmap, use Camden (current day) or NSW 24 and 48h forecasts.

Some handy tips:

• Windity has a handy precipitation forecast in the airgram.
• Blipmap can show you when the thermals are likely to start by looking at the height of critical updraft strength and the cloudbase potential plots.