help tor2web work better

tor2web complains of abysmal performance on (some) hidden services. Helping them improve their performance and stability could be a good way to better understand what's going wrong with hidden services. Plus it will help them popularize the overall concept.

I'm going to use this as the catch-all trac ticket for the topic.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information