Set default site size limit to 100MB

[defder-su]

As a content creator, I'm interested in ZeroNet, because it looks like a way to make author content available for tens and hundreds years.

There are no problems with tiny zites, but I have noticed zite has to fit within default site limit to survive. The default limit was set to 10MB and perhaps it was reasonable when ZeroNet started. But it's been about 9 years, there's a lot more storage space available, currently 10-25MB looks tight.

It might seem optional files feature will help. Indeed, the feature is helpful for many scenarious such as apps distribution and uploadable content. But using it for unique author content (when one is an integral part of zite) results to lose unique content.