There are many reasons to use a web site, here are a few.
1. To have a calendar for troop members to compare with their other events.
2. Allow other troops to see when you are doing things in case they wish to work out a shared activitiy.
3. Use a message board for your leaders to post ideas for future PLC's.
4. Post detailed information that you would put on an activity permission slip.
5. Share photos of activities and events.
6. Provide a place you can send other boys to, in order to interest them in joining your troop.
There are many other things you can do with a web site as you go thru this one perhaps it will give you even more ideas you can share as well.